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14 Jun

Three card Slide Rules

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A card slide rule for horse power calculations, advertising Lambeth cotton rope, ink owners signature. Fuel Cost calculator published by Meldrum Brothers and advertising “The Meldrum Forced Draught furnace.” ink signed for owner. The Lambeth Cotton Driving Rope Horse Power Calculator, ink signed for owner. Reverse has hints on designing a rope drive. All three in overall good condition but slightly grubby through age. In an original but scruffy leather pouch. Read More...
14 Jun

Hudson’s Pump Duty Computing Scale

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An unusual and rare complex slide rule for Pump duty calculations, in celluloid. Original case. Read More...
14 Jun

Hudson’s Shaft Beam & Girder Strength Scale

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An unusual and rare complex slide rule for calculations relating to beam and girder strengths. In original case with instructions. Made of celluloid. Read More...
14 Jun

Unusual Boxwood Slide Rule “Collins Milk Scale”

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Collins Milk Scale, a boxwood slide rule made by Brady and Martin, Newcastle-on -Tyne, inked owners name. Scales for temperature, Lactometer reading for specific gravity and a Gerber scale (primary and historic chemical test to determine fat content} Read More...
14 Jun

Antique Ross-Zentmayer No. 1 Binocular Brass Microscope #5351 – c1884, Cased

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Offered for sale and a rare find – an Andrew Ross-Zentmayer No.1, serial number 5351 of immense size.The foot engraved “Ross London 5351” with: – Jackson-Lister type limb design– Wenham binocular with mechanical draw-tubes– RMS objectives– helical-cut coarse focus– vernier screw/lever fine focus– rotating mechanical stage with x/y controls and external 360 degree scale– swinging sub-stage for oblique illumination– sub-stage accessories that locate into a dovetail recess– large 3 inch plano-concave reflector showing some age and still perfectly functional And overall, Read More...
14 Jun

STEWARD FOUR INCH TRANSIT THEODOLITE

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SHIPPING BY FEDEX, DHL, DPD, ETC. FULLY TRACKED.  Contact Email:  [email protected] Read More...
14 Jun

A large hand held telescope by Dollond.

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An excellent example of an early 19th century 4 draw telescope by Dollond, London, measuring 29 cm long when closed and 106 cm (41.5 inches) fully drawn with a 2 inch objective main lens. The barrel is finished in black lacquer and the collars, eye piece, lens cap etc retain all original lacquer.  The first draw has a four lens erecting system and is constructed in three segments. All damage free and in remarkable original condition – a real collectors piece. Read More...
14 Jun

~ MINIATURE CODDINGTON LENS AND LOOP-AS NEW~

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A Victorian era miniature Coddington lens with white metal frame and finger loop handle. Maroon card case has blue velvet liner. Case meaures 5 x 2 x 1 cm. with brass hook intact. Unbranded. Read More...
14 Jun

~FINE 18th C. SCREW BARREL MICROSCOPE-UNUSUAL~

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A fine and near complete screw barrel microscope c. 1780 with a near complete array of accessories including 6 individual lenses (4 capped, 2 uncovered-low power) and the unusual addition of a 4 lens turret for quick change magnification of specimens. 3 of 4 numbered bone sliders as well as the usual accessories and a hand held b/w paddle for flora and fauna gross samples. Unsigned. The near perfect black sharkskin case (small compression fracture to lid) has both eared Read More...
13 Jun

three draw presentation telescope – Adie & Son, Edinburgh.

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A three draw brass telescope with a mahogany barrel, the first draw signed, ‘Adie & Son, Edinburgh’. It measures 9.5 inches long when closed and 29.5 inches fully open with a main lens of just over 1.5″ diameter. The ray shade is engraved, ‘JOHN ROBERTSON from Lady Glenlyon. Aug 6th, 1840’.                                                _____________________________ Anne Murray, Duchess of Atholl (1814 – 1897) Read More...
13 Jun

8 x booklets, scientific instruments, Charles Baker.

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Booklets containing ‘Classified list of second-hand scientific instruments’ by Charles Baker, 244 High Holborn. They measure 21.5 cm x 14 cm and printed for the years; June 1922, October 1922, June 1923, January 1924, April 1927, October 1929, October 1932, April 1933. Read More...
13 Jun

George 11 silver pap boat, 1736.

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A George 11 solid silver pap boat by William Gwillim, London 1736, weight 56g, length 11.2 cm. With initials to the base: BB*M. Read More...
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