Colliery barometer with painted brass 8" dial marked 27–33 inches of mercury, the upper part bearing the legend "Hennessy, Swansea," the maker/retailer, the lower portion marked "Colliery Barometer" and set with large curved mercurial thermometer having a scale of 20-120 degrees Fahrenheit. Heavy blued-steel pointer, substantial bevelled glass having gilt brass telltale to centre with adjustment wheel. Brass bezel with patinated finish, silvered inner ring. The case of original japanned finish with three radially-mounted fixing tabs, the rear with heavy brass movement fixing ferrules, compensation adjustment screw.

A rare piece of our industrial heritage dating from the late 19^th century. Bearing in mind its origin and service life, this antique aneroid barometer has survived in excellent condition and working order.

Colliery, Mining or Pit Barometers were made specifically for use in mines from early in the 19th century, with a higher reading scale than above ground barometers. In 1872, an Act of Parliament was passed making their use compulsory. Records clearly showed that before an explosion in a coal mine there had been a diminution of atmospheric pressure. The Act required a barometer to be placed above ground in a conspicuous position near the mine entrance but they were always made of solid construction so they could also be used underground. With the scale going up to 33" the barometer could be used at least 2,000 feet below sea level.

Bernard Rudkin Hennessy is recorded as working at 5 Wind Street, Swansea from 1841-1875 as a clockmaker, scientist, gunsmith and optician, as well as a shipping magnate (he owned for a while the iron sailing vessel 3-masted barque Atlantic). He is noted in Peates, Iorwerth Clock and Watch Makers in Wales as a contractor to the admiralty, and was a maker of nautical instruments, including chronometers, barometers and sextants.

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Darton altimeter with finely engraved and silvered brass 4¼" dial, the outer altimeter scale 0–7,000ft, the inner barometer scale 24–31 inches of mercury.  Upper portion marked "Compensated," "No. 851," the lower with maker’s legend "F. Darton & Co, London." Blued-steel pointer, rotating bezel with fine spur index, set beneath bevelled glass. Heavy duty 2" deep brass case with block-mounted swinging arm and suspension ring, the rear with compensation adjustment port and screw set at 4 o'clock, broad arrow military ordnance mark to centre.

These aneroid instruments may be considered scarce.  Few survive, and this antique Darton altimeter remains in 'as found' original condition - sensitivity and transition remain excellent. It is most likely that the War Department issued this to the Army as opposed to the Royal Navy, with possible users being the Royal Engineers. A fine original instrument for the collector.

Banfield, Edwin, Barometer Makers and Retailers, 1660-1900 records Francis Darton & Co as working from various addresses in London from 1834 onwards, and the company existed up until the 1990s.

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This Falconer barometer has a silvered and engraved 8" brass dial, annotated “Typhoon or Gale 28.50 to 29.40," "Squalls & Rain 29.40 to 29.75," "Fair & NE Monsoon 29.75 to 30.25," "Strong Monsoon 30.25 to 31," all in inches of mercury. Twin semi-circular scales annotated 28–31 inches of mercury and 710-790 mm of mercury, top portion of dial marked "Specially designed by G. Falconer & Co, Hongkong," across the dial the legend "Aneroid Barometer," the lower portion marked "For use in the Far East" and having large curved mercurial thermometer to dial bottom with scale from 0–160 marked in degrees Fahrenheit, also marked "Fahrenheit Thermometer." Blued-steel pointer, the heavy bevelled glass set with gilt brass telltale and adjusting wheel. Brass bezel, japanned brass case with three radially-set mounting brass fixing plates at 12, 4 and 8 o'clock.

A very unusual and interesting instrument in very fine condition, highly sensitive with almost stepless transition. The case, very dilapidated when found, has been cleaned and re-coloured, the bezel polished. It remains completely original in all other respects. This Falconer barometer has great aesthetics, is rare and interesting, and is a very desirable item.

George Falconer was a Scot who worked as an apprentice in Hong Kong to Leonard Just in the 1840s and then Douglas Lapraik (also a former apprentice of Just's).

Falconer was listed in the 1859 Hong Kong Directory as the head man for Douglas Lapraik Watchmaker, so he probably ran the business for Lapraik. In April 1866, Lapraik closed down his watch-making business, transferring it to Falconer, and the firm was renamed Falconer & Co. Falconer died in London in 1875, while the firm remained in Falconer family hands until 1997. Today, Falconer Jewellers store is located in the prestigious Peninsula Hotel, Hong Kong's oldest luxury hotel.

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Pocket barometer with finely engraved 2” silvered dial signed "Negretti & Zambra, London," with instrument serial no. "575," single scale 16-31 inches of mercury, equating to approximately 18,000ft altitude, and fine blued-steel pointer. Rotating bezel with fine index point. Bevelled crystal. Substantial deep open-faced English silver case with compensation port to rear having sliding dust guard. The bow with hallmarks for London and date letter “h” for 1863. Fine first quality movement.

This is an extraordinary instrument in almost all respects. Manufactured in 1863 it represents one of the very first of its type. Negretti & Zambra had only just filed the patent (1861) for the pocket watch-sized barometer, and this is one of the first. The movement exhibits some very early characteristics: the primary lever is loaded with a Vidie-style coil spring; provision is made for three adjustments - rate of deflection, temperature compensation and, most unusually, capsule tension; the secondary lever clearly is fitted with a bi-metallic compensation device though this is not stated on the dial (the principle of temperature compensation was very much in its infancy at this time). The chassis is most unusual in that it is milled to accommodate the close proximity of certain component parts - presumably this afforded a lower profile for the movement as a whole. There are many and extensive embellishments not present in most other movements: a finely cut and contoured primary lever; blued set screws; extensive gilding of components; and decoration of the chassis. The dial must also be mentioned, since this is not of the traditional flat plate form.  It has a deep circumferential return locating it snugly into the silver case.

The dial almost perfect, save two very slight marks only visible in oblique light; the case with minor hazing overall, essentially dent-free; crystal with a very small chip to the bevelled edge; very clean and crisp overall.  Clear, well-struck silver hallmarks. This pocket barometer is in excellent and completely original condition, with good sensitivity and progression.

Precise use for this instrument is unclear as the extensive barometric range is calculated only in inches of mercury.  It might be considered a special order placed with the maker for use in scientific research.

Negretti & Zambra, founded in 1850 as makers of scientific instruments, were the most prolific and leading makers of all types of barometers during the second half of the 19^th century and into the early 20^th century. The partnership exhibited at the Great Exhibition at the Crystal Palace in 1851 and won a Prize Medal. Negretti & Zambra held the appointment of instrument-makers to Her Majesty Queen Victoria, Prince Albert and Edward VII, the Royal Observatory and the British Admiralty (see Banfield, Edwin, Barometer Makers and Retailers, 1660-1900).

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Desk compendium comprising clock, aneroid barometer and thermometer. The clock with brass enameled brass white dial, the chapter ring marked in Roman and Arabic numerals in hours and minutes, and fine blued recordon-style hands.  Heavy bevelled crystal glass, the case rear with matching glass affording viewing of movement, side mounted release button to winding and hand setting squares, platform lever escapement set to vertically mounted frosted gilt plates, highly polished screws and spring work. The clock movement based upon that of a carriage clock.

The matching barometer scaled from 26-31 inches of mercury, conventional meteorological annotations, blued-steel flighted arrow index, the lower dial marked "Aneroid Barometer" and intertwined "ARED," Antoine Redier's decorative monogram. The rear with curved inset mercurial thermometer set on a silvered dial with the legend "Fahrenheit," the scale marked from 20-110 degrees, all set below a matching fine bevelled crystal glass having port to top with calibration screw. Original gilt brass setting key.

The pivoting instruments displayed upon a turned stem raised on a bell foot, stamped with serial no. "438," with suspension ring over.  The desk compendium contained within its very rare, original, fine-grained leather over wood travelling case having burgundy velvet lining to interior, brass closing catches and keepers, drop down front panel with glazed viewing port, carrying handle to top, and raised on brass pea feet.

The instruments, having been cleaned, regulated and overhauled, remain in completely original condition, retaining much of their original gilding. The case having had extensive restoration, the lining and carry handle replaced, the hinge to drop-down front restored, and the exterior surfaces re-coloured.

This Antoine Redier desk compendium is a very rare and most attractive item from one of the preeminent maker of clocks and registering instruments of the time.

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Short & Mason barograph recorder and barometer with mechanism overall of fine gilded brass construction. Conventional 8-day drum recorder, bearing "Pat. No. 3715.02" to top plate and serial no. "5493" to lower plate, with good quality platform escapement, captive winding key and top cover.  Hinged and sprung paper clip with closing catch to top, the whole mounted on a conical base with static top mounted platform gear, serial no. "5044."  The barometer set on separate, unsigned chassis with fluted border and raised on four turned brass supporting pillars, eight capsule pressure sensing set with adjustment wheel over, having well-engineered connecting mechanism and driving delicately executed, grained white metal swinging gate arm and indicator to barometric scale. Base-mounted arrester bar with single stop pin.  Silvered and engraved brass open-faced 4½" dial with conventional annotation calibrated from 28-31 inches of mercury and bearing registered design no. "428606" to bottom. Ivorene plate to cabinet base with retailer's details. Conventional corked ink bottle with dipper, inset to cabinet base. The whole contained within its original oak case with lift-off cover of heavy bevelled five-glass construction. Frieze drawer to bottom for charts.

The instrument, having been extensively restored, the cabinet disassembled, cleaned, re–lacquered and polished, the mechanism cleaned and serviced, remains entirely original in all respects. The recording paper for an up-to-date test shows good sensitivity and function.

Instruments with this combination of barograph and aneroid barometer may be considered scarce. The majority found as untouched require re-lacquering to the case due to sun damage.  This Short & Mason barograph is particularly unusual in that the mechanism is in such good original condition. It has restored very well.

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The top plate with maker's signature and address, silvered scale from -5 degrees to 150 degrees, vernier to 30 arc minutes, milled knobs to mirror vernier and shipped mirror adjustment tool, arm mounted scale magnifier. Pin hole sight to blind, red and green shades with activation port and dust guard to rear. Mirror azimuth and declination adjustment squares. Threaded drum cover/handle.

The whole contained within its original red velvet-lined leather case with some wear, good colour and patination, the straps worn in places but sound.

These instruments are hard to find and the earlier lacquered patterns are rare. This one is in fine condition retaining most of the original lacquered finish with only minor abrasions, the mirror bright with no perceptible signs of deterioration, the shades in similar condition.

Mechanically the instrument functions perfectly. A very crisp example of this much sort after instrument by a top English maker.

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A  set of three quality Liston knives made by the French instrument maker W. Charriere in Paris, Circa 1860.  Liston knives were used in limb amputation and were renowned for their sharp steel. The knives are made from polished steel with crosshatched ebony handles and have been manufactured to the highest quality. They are still razor sharp and no cracks in the ebony handles. So in mint condition and the knives are 37,5 - 34 - 29,5 cm long

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An early C. Zeiss, Jena  dissecting microscope, C 1860. It is complete what means four objectieves. It is signed on the black brass stage "Carl Zeiss, Iena" ( the city Iena becomes later Jena). Measurements case 11 x 11 x 6,5 cm.

Look for shop information on website www.vanleestantiques.com 

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A very rare complete set of instruction aid, presenting a serie of 12 geometry models on thin card, celverly constructed using both flaps, and coloured cotton, to indicate geometrical planes and projections.

The set is complet with its 12 original folded cards, all with their cotton lines and parts moveable, the two booklet for the serie 1 (models 1 to 6) and serie 2 (models 7 to 12), the four page folded sheet entitled "Problems suggested as exercices for the student" and two (similar) folded advertisements sheet in ink paper.

Thomas Jones (1844-1826) became a member of the Institution of Mechanical Engineers in 1887 and invented his "Descriptive geometry models for the use of students in Schools and Colleges" in 1893.

A well preserved 2 dimensions and 3 dimensions geometrical teackind aid with fragil material.

Rare.

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“Cosmographie”, 4to (25×20 cm), [2] and 512 pages ; contemporary black half-leather.

Even if the general title is “Cosmographie” the manuscript deals with several different subjects : scientific instruments illustrated with 96 drawings ; measurements of the movements of the earth and measurements of the position of the stars with 28 drawings ; description of the celestial chart and stars with 25 drawings and a celestial chart in two parts drawn and handcoloured ; earth (form, movement, longitude, latitude, meridian) and measurements of its movements with 25 drawings ; geographic maps and cartography (different projections, how to draw maps, etc.) with 30 drawings ; atmosphere of the earth with 5 drawings ; description of the sun (diameter, movements, chemical composition, solar time) with 13 drawings ; dialling with 9 drawings.

This manuscript was written for the programme of the Scientific Baccaulaureat in the 1860s'. Indeed, pages 184, 310 and 446 give the details and contents of a "Programme" in 17 points which matches perfectly with the new scientific programme decreed by the French Government in 1859/1860.

Therefore we can suppose that it was, either a project for a new publication, or the personal manuscript of a teacher for the preparation of his lectures.

The first hypothesis is more probable : indeed, the quality of the technical drawings seems to indicate that they were meant to be engraved.

For the redaction of his own textbook the author/writer used at least 4 different sources.

Below, the details of the sources corresponding to each section of the large manuscript :

-pages 1-60 : based on Delaunay, Cours élémentaire d'astronomie, 1860 ;

-pages 61-99 : based on Ganot, Traité élémentaire de physique expérimentale, 1859 with a lot of additionnal calculuses and a complete new organisation of the contents ;

-pages 100-112 : based on Delaunay ;

-pages 112-129 : mixed between Delaunay and Ganot with some additions ;

-pages 130-181 : based on Delaunay ;

-pages 185-213 : based on Marquet, Leçons nouvelles de cosmographie, 1864 with additional drawings and short texts. We can notice also that the drawings are more sophisticated than Marquet's engravings. Furthermore there are two full-page drawings (pages 205 and 209 coming from Delaunay) ;

-pages 213-216 : based on Delaunay ;

-pages 217-220 : based on Marquet ;

-pages 221-239 : based on Marquet for the 4 first then on Delaunay with a superb full-page drawing in red of Foucault's gyroscope ;

-pages 240-260 : based on Marquet ;

-pages 247-277 : based on Marquet BUT with additions of text and drawings of figurative constellations which are original and unpublished ;

-pages 277-308 : mixe sources between Marquet and Delaunay ; 

-pages 311-325 : based on Marquet with additionnal drawings and additionnal text ; 

-pages 325-329 (Usages du sextant) : based on Marquet without addition ; 

-pages 329-346 : based on Marquet with used of Guillmin, Leçon de cosmographie, 1860 for pages 338 to 345 ("Signaux astronomiques" to "tropiques, cercles polaires");

-pages 347-371 : based on Marquet with one additional drawing and a short text ; 

-pages 372-412 : based on Marquet with five additionnal drawings (pages 377, 390, 396, 403 and 409). 

-pages 413-444 : based on Marquet with one additionnal drawing (page 424) ; 

-pages 447-512 : based on Marque with one additionnal drawing (pages 454). 

As indicated previously in the detailed listing, the part concerning the stars and the celestial chart is very innovative in its presentation. This part is illustrated with individual drawings of every major constellation : the writer cut out each constellation from a printed celestial map then drew their symbolic representations with different colours. We did not find such a presentation in the contemporary textbooks or in any of those published during the 19 th century. This particular layout underlines the pedagogical effort provided by the teacher for his students.

As explained before this manuscript is based on contemporary textbooks copying some usual/classic illustrations.

However, the texts used are entirely rewritten and the general organisation of the work completely new.

A splendid and richly illustrated example of an unpublished and anonymous French textbook about scientific instruments and general astronomy.

The post A richly illustrated unpublished French manuscript on scientific instruments, astronomy, cartography, surveying and dialling, circa 1860 appeared first on Fleaglass.

Antique presentation barometer with 5” glazed porcelain hand-decorated dial, the upper portion having barometric scale from 28-31 inches of mercury, annotated "Falls for Warm, Wet or More Wind", "Changeable," "Rises for Cold, Dry or Less Wind," "Marine Aneroid Barometer made by Dolland, London," the centre with serial "No 911," the lower portion marked "The Shipwrecked Fishermen & Mariners' Royal Benevolent Society," maker’s address "26 Suffolk Street, Pall Mall, East, S.W." and the English flag containing the letters "S-F-M-S." Blued-steel pointer set beneath heavy bevelled glass with gilded telltale to centre. Heavy brass bezel, first quality part nickel-plated aneroid movement of conventional pattern driven by a 3” capsule. The whole contained within a highly polished drum pattern case, probably of nickel construction, compensation port to rear set at 3 o'clock. The case bottom with single projecting fixing lug. Set on a carved oak stand with twin stylised dolphins. Silvered brass presentation plaque inscribed "Presented to Mr E.G. Tupman in recognition of 44 years valuable services, 1917."

This presentation barometer is unique. Not only a very fine example of a much sought-after instrument but a commentary on the life of a truly exceptional man. Edward George Tupman (1832-1917) was a Trinity House pilot and the first Coxswain of the Exmouth Life Boat. The instrument is of the highest quality, very sensitive with stepless transition. The stand is a beautifully executed carving in contrasting cuts of oak depicting two stylised dolphins with a rope work border. The instrument, secured to the stand by a hidden lug to the rear, when removed from the stand revealed a highly polished mirror-finished case, this finish largely protected from the atmosphere since it rested upon the velvet cushion shown. Conservation has revealed a good proportion of this finish. The dial, as with all other such porcelain ones, has extensive superficial crazing to the glaze, but with no 'damage' - it remains crisp with excellent colour and resolution.

The instrument now presented reflects much of its original visual quality - it remains 'as found' in all respects. A one of a kind collector’s item.

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Japanned high quality timber case with suspension rings set at each corner, the instrument would have been suspended by eight springs in order to reduce the effects of engine vibration. Oval brass tag to top right front annotated "J 2397," the font typical of the first quarter of the 20th century, the number probably a user inventory number. Diagonally opening top with swinging catch keepers, glazed inspection port set in an alloy frame, circular cut out to base with twin connections to Pitot and Static ports marked "P" for Pitot, "S" for Static. Arrestor leaver for recording arm. The mechanism with alloy drum having clockwork, rotational period of one hour. Alloy recording arm, pressure diaphragm sensing vessel. Vertical indicator scale marked "M.P.H.," reading from 0 to 200, "Pioneer Instrument Company, Brooklyn, New York" and "525-16." Whilst tempting to think that this last number reflects the year of manufacture, it seems unlikely as the company was not founded until 1919.

This instrument amongst the earliest supplied by this specialist manufacturer of aircraft instruments, it represents one of the first pieces of technology designed to accurately determine aircraft performance and is hugely significant in aeronautical terms. The Pitot tube, though invented much earlier, first appeared in aircraft around 1912, then coupled to a manometer driving a metallic diaphragm. The chassis stamped "Made in France" and further marked "95," it is likely therefore that Pioneer sourced the parts (certainly the clockwork) from a source of aeronautical instruments in France; the pressure diaphragm may also be of French manufacture. The design, technology, full scale deflection of the instrument (we know aircraft had achieved only 145 MPH in 1918), and the start up of Pioneer all strongly support a date of manufacture to the very early 1920s.

The case with numerous external marks to the japanned finish, the clockwork running perfectly, the pressure sensor works well with good sensitivity but may need calibration. The chart fitted to the drum made from modern graph paper. The recording nib, as would be fitted to a barograph, is missing (easily replaced).

A very desirable collector's piece.

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Antique atmos barometer of grained and lacquered brass construction with silvered and engraved brass twin dial/registration plates of rectangular form: the outer having calibrations from 28-31 inches of mercury with divisions set at 1/20^th of an inch, annotated “Stormy," "Rain," "Change," "Fair," and "Very Dry," and bearing the legend "Atmos – Barometer;" the inner raised on a single turned pillar with twin curved thermometers, at left a reddened spirit type with plate marked "Fahrenheit" and calibrated 30–110 degrees, at right a Mercurial type, the plate marked "Centigrade" and calibrated 10-50 degrees, the plate further marked "Atmos – Barometer" to top, "Made in France" to lower left and "Brevete S.G.D.G," a French non-government backed form of patent.

Heavy main chassis plate, the principle lever of L-shaped form raised on twin turned pillars with 'knife-edge pivots' and bearing upon a single steel coil spring in compression raised on a turned pillar and seated on a threaded adjustment platform, the spur acting through short levers driving a grained, white metal indicator arm raised upon a turned pillar. The mechanism driven by twin 2½" capsules. Attractive grained and laquered brass telltale with short operator's extension running in a nickeled escutcheon.

The whole contained within its original polished mahogany single-glass case, finger jointed corners, the top set with nickeled brass carry handle. Base set with screw adjustment port and with retailer's paper roundel affixed, marked "J. Stevenson, Optician, Aberdeen" with pen annotation "AH/-, OE/-."

The instrument, having the benefit of light conservation, remains in original condition. Setting a date of manufacture is not easy. There is little doubt that this originates from the later half of the 19^thcentury - the glass, clearly original, is uneven with flaws atypical of later manufacture, and the mechanism reflects very much the Vidie movement, suggesting a date nearer 1850. The jeopardy here, though, is that, although the original Vidie Patent was improved upon very quickly after 1850, some makers probably continued to replicate it well into the last quarter. Reasons for this may have had as much to do with practice as ease of manufacture, a coil spring arrangement being a far simpler mechanism to produce than a tempered C-type spring arrangement. The instrument may have been influenced by the introduction of the drum barograph recorder in 1867, as it seems very much a half-way house. On balance, the evidence would suggest a date of manufacture circa 1870-1880.

Very much a collector’s piece and a fascinating commentary on the development of the aneroid barometer. See Banfield, Edwin, "Barometers: Aneroid and Barographs," p51 and p53, fig. 39 for description and image of a similar barometer.

Dimensions: 7" wide x 6" high x 4¼" deep

Stock No: BA0231

Price: POA

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A fine mid Victorian microscope oil lamp in its original stained pine case, C 1880. The lamp is engraved on the circular base:   Swift & Son - LONDON   .   The lamp stands on a brass circular base with a tall upright column to the back. The lamp assembly can be positioned at the required height with a knurled wheel locking it in place on the column.   A brass collar holds the oil bottle.    The lamp comes with the usual ceramic shade with the follow imprint: J. Swift & Son - University optical works - 81 Tottenham court road - London WC - Registered. Condition: Cosmetically the lamp is superb having seen very little use. The lacquer coverage is 99% with almost no wear. The shade had a small crack but further on in good condition. Mechanically all works well and just as it should. Dimension box 31 x 13 x 12 cm.

Look for shop information on website page www.vanleestantiques.com 

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'Mathematical Instruments'.

'Their Construction, Adjustment, Testing, and Use.

Comprising  Drawing, Measuring, Optical, Surveying, and Asronomical Instruments'.

By J.F. Heather M.A., 1892, hardback 15.5 cms x 12.5 cms, compiled in 3 sections:

1. Drawing and measuring instruments (155 pages).

2. Optical instruments (141 pages).

3. Surveying and astronomical instruments (161 pages).

With numerous illustrations, diagrams, adverts etc.

Very good condition, the first 2 pages coming half away from spine.

Post: U.K. £5, Europe £10, U.S. £15. Paypal accepted.

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Dent barometer with silvered brass 4½" dial annotated "Stormy," "Much Rain," "Change," "Fair," "Set Fair,"  "Very Fair," calibrated from 27½-31½ inches of mercury, further annotated "Aneroid Barometer" in script. The lower portion bearing the maker’s legend "E.J. Dent, Paris," "Fahrenheit’s Scale," serial no. "2841," and having original curved spirit thermometer calibrated from 10-110 degrees Fahrenheit, the red-coloured dye still visible. Blued-steel pointer. Flat glass with fine, knurled, gilt brass telltale adjustment wheel to centre. Lacquered spun brass case and bezel, the bezel with trademark Dent herringbone pattern. Set pillar with suspension ring to top. The reverse with screw calibration port set at 7 o’clock. The whole contained within its original mahogany sloping top case with circular glazed viewing port, highly polished interior with blue velvet-faced recess. Brass escutcheon and lock, and brass hinges set with steel screws.

This is a very early instrument and represents one of the first aneroid type barometers sold. The movement is of the early coil spring "Vidie" type (Vidie is deemed the father of aneroid or non-mercurial barometers).  It is known that Dent cooperated closely with Vidie in the mid 19th century, but it cannot be stated with any degree of certainty as to whether Vidie manufactured the movement or Dent did so under license. The capsule is of the very early copper type, the top pivot plate of finely-cast iron bearing upon a coil spring. The chassis is retained within the case with square brass nuts.

The Dent barometer and case remain in, essentially, very original condition: some slight dents to brass case, the movement having been serviced, a good repair made to fusee chain, the escutcheon to the case a replacement. Retains most of the original lacquer and colour.

E.J. Dent (1790-1853) was a famous English watchmaker noted for his highly accurate clocks and marine chronometers, and is recorded in Banfield, Edwin, Barometer Makers and Retailers, 1660-1900 as working from 1844-1851. Dent was the first to sell the Vidie aneroid barometer in England in 1847, and in 1849, he published A Treatise on the Aneroid, a Newly Invented Portable Barometer. He exhibited at the Great Exhibition at the Crystal Palace in 1851 when the Vidie barometer was awarded a Council Medal.

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Rare hugh and early Plössl "No. 1" Microscope, fully made of brass, original lacquered, ca. 1828 - 1831, hight 57 cm (22"), a set of 4 numberd objectives (instead of 5), 1 numberd eyepiece (no. 2), coarse focussing, signature on the tubus "Plössl in Wien"; an early model of Plössl with the round pillar; mechanics works well, optically and cosmetically good, (some loss of lacquer), a very rare microscope, no more accessories and no box. - For more microscopes see:  www.kambeck.com.

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Very rare microscope of Carl Kellner, Belthle & Rexroth in Wetzlar, brass with original blackened foot, brass parts original lacquered, ca. 1860, hight 33 cm (13"), 3 oculars (no. 1, 2, and 3), 1 objective, coarse adjustment by hand, fine adjustment behind underneath the column, signature "C. Kellner in Wetzlar" and "Belthle & Rexroth. No. 429"; all parts are original and in a good condition, on the foot some loss of the black colour, mechanics works well, optically very good, cosmetically good, beautiful box. - For more microscopes see:  www.kambeck.com.

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Fine and rare Microscope of Engelbert & Hansoldt, fully made of brass, original lacquered, ca. 1865 - 1867, hight 32 cm (12 1/2"), 3 oculars (no. 1, 2, and 3), 3 objectives (no. 5, 7, and8), all accessories are complete and original; coarse adjustment by hand, fine adjustment underneath the stage; signature on the microscope stage "Engelbert & Hensoldt Wetzlar"; number "692" underneath the tubus support, all parts are original and in a very good condition! Obviously the microscope has not been used very often! Mechanics works well, optically and cosmetically very good! beautiful box. - For more microscopes see:  www.kambeck.com.

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