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17 Aug

The origin of precision astronomy: The Hooke-Gascoigne micrometer in the Philosophical Transactions, 1667

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A decisive moment in the history of science: William Gascoigne invents the micrometer, communicated here by Richard Towneley and Robert Hooke in two issues of the Philosophical Transactions for 1667 (nos 25 & 29). Comprising: 1. TOWNELEY, Richard, ‘An Extract of a Letter, Written by Mr. Richard Towneley to Dr. Croon, Touching the Invention of Dividing a Foot into Many Thousand Parts, for Mathematical Purposes; HOOKE, Robert, ‘More Wayes for the Same Purpose, Intimated by M. Hook’, Philosophical Transactions No. 25 Read More...
17 Aug

18th century telescope – James Chapman.

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An 18th century mahogany taper barrelled telescope, signed on the single draw, ‘Jas’ (James) Chapman, St Catherines, London’, with foliate design engraving around the signature. He worked from St Catherines from 1774 – 1796. The telescope measures 39″ (99 cms) to focus with a main lens of 35 mm, gicing a clear sharp image with a magnification of 32 x. This is quite high power and limits the field of view. It has protective sliders to each end. In very good Read More...
17 Aug

18th century decagonal telescope.

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Unsigned, single draw decagonal, taper barreled telescope. The main lens is a single element (non achromatic) which dates it to 1750’s or possibly earlier. It comes to focus at 29″ (74 cms) and the draw tube is retractable and has a five lens eye-piece. The barrel has an age crack which is not serious. The telescope gives a fine sharp image on the centre of view. It comes with a later wooden display stand. Read More...
13 Aug

Abney level & case – R.W. Wright, London.

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An early 20th century Abney level with a brass scale & magnifyer with 1.5″ bubble level and 1.75″ compass with jewelled needle and locking bar, the compass with cardinal points and 360 degree outer circular  scale. The body is additionally engraved, ‘R.J. Money’ (presumably the owner). It has a bakelite eye-piece. With threaded stem for tripod mounting. In original lined leather case. Read More...
12 Aug

A SPECTROSCOPE by R.J.BECK , IN FITTED CASE , ALL IN GOOD WORKING COND.

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CASE  5 IN x 1.75 IN. x  2 IN HIGH , CLOSES WELL  WITH HEALTHY CLICK, NOTHING BROKEN, NO REPAIRS Read More...
12 Aug

SOLID SILVER HALLMARKED CHARLES GIBSON MEDICINE SPOON ,ENGRAVED ” GIBSON INVENTOR ” DATED 1828

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A FINE CHARLES GIBSON SILVER SPOON , CLEARLY HALLMARKED CHARLES GIBSON, LONDON 1828. ALSO ENGRAVED ON STEM  ” GIBSON INVENTION ”     12.5 CMS LONG, 25 GMS NO REPAIRS ,NOTHING BROKEN , SOME LIGHT MINOR  SCRATCHES   Read More...
11 Aug

~FINE SWIFT PARAGON No.2 MONOCULAR MICROSCOPE~

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I can only describe this Swift & Son Paragon monocular microscope as a No. 2 (student model) due to it’s diminutive stature. Standing only 12 inches tall (15 inches fully racked). it is constructed from bright and anodised brass c.1910. Simply yet extensively accessorised, it boasts 6 signed Swift objectives ranging from 1 inch to 1/12  of an inch (repeat on 1/6-later addition-will look for anything missing i.e. 1/2 or additional eyepiece). The 1/12 inch is marked as oil Read More...
07 Aug

Coxeter’s Civil War Era Bullet Extractor

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A fine example of Coxeter’s bullet extractor. Unsigned but identical to the example shown in the 1870 the Coxeter & Son’s catalog. The instrument was introduced by Coxeter at an earlier date. An example can be found in Weiss’s 1863 catalog. It was used for extracting Minnie balls not musket balls. The Coxeter catalog cut shows the instrument with a Minié ball in place. British instruments were used by both sides during the American Civil War. For a discussion Read More...
07 Aug

Surveying compass – J.H. Steward.

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A blackened brass late Victorian 4 inch diameter surveying compass, signed to the lid, ‘J.H. Steward, 406 & 457 Strand, London’, with folding prism and sighting bar, the prism with lens cover and two sun filters. A button under the sighting arm locks the dial in place. Nice condition. In leather case. With threaded lug underneath for tripod mounting. Read More...
06 Aug

Artificial Horizon – Negretti & Zambra. Lacking bottle.

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An antique late Victorian artificial horizon for sextant navigation by Negretti & Zambra and in it’s original fitted wooden case : the instrument comprising a shallow cast iron tray with a small pierced hole to one corner (for decanting) and a brass ‘tent’ shaped cover with twin sloping glazed panels, one edge signed ‘Negretti & Zambra London’, and all in it’s original fitted mahogany case with lock (no key) and twin catches, circa 1800s. Please Note – the mercury Read More...
06 Aug

Small size – Portable astronomical telescope with equatorial mount.

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A brass astronomical / surveyors telescope with an equatorial mount, no makers marks, in original fitted wooden case (no key). The base has a small threaded hole for mounting (no stand present), a revolving prismatic compass with transit lock and push up prism, and connects to the lower arm via a thumbsrew pivot and an adjustable ‘arrangement’ below. The lower arm has twin tiny bubble levels and is connected to a counter weighted upper arm, on which, the telescope in Read More...
05 Aug

~NICE SCREW BARREL MICROSCOPE-COMPLETE~

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Although the case may be newer, this screw barrel microscope is fully functional and very complete c. 1820. Wonderful roping of the brass, sure and tight rack and pinion focussing, great optics (object lens has chips to edge but outside of the optical center), 6 numbered objectives (4 capped, all beads intact), 6 numbered bone sliders (all specimens present), turned bone handle, forceps (tines missing), aquatic vial with stopper, brass wet cell slider (some glass inserts absent) and 50% original Read More...
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