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26 Sep

1950’s Whirling spychrometer Casella London    

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A 1950’s Caella London Whirling psychrometer, also known as a sling psychrometer, for measuring humidity, designed by J. J. Griffin & Son Ltd. and made to B.S.2842 by Casella, London, UK, 1950-1953. Contains wet and dry bulb thermometers. Whirling or sling psychrometers are types of hygrometers for measuring air humidity. They contain two thermometers, one of which has a bulb kept wet with a cloth soaked in distilled water. The device is whirled rapidly in the air, and the difference Read More...
22 Sep

~GOOD UNSIGNED GREGORIAN TELESCOPE c.1800~

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A well used but not abused 2 1/2 inch diameter, brass Gregorian reflecting telescope c.1800. Early roping of the brass, circular knurled nuts to the body tube, pivoting and rotating stem terminating in folding cabriolet legs with post screw for the field. Overall length (including eyepiece) is 18 inches and it stands 14 inches tall. Barrel has one small dent 1/2 inch from the end. Excellent primary and secondary speculum metal mirrors. Good optics with focussing by short worm Read More...
20 Sep

Antique Ross-Zentmayer No. 1 Binocular Microscope in Brass by Ross London c1885

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Brief Summary:This really is the real deal – an Andrew Ross-Zentmayer No.1, serial number 5380, the foot engraved “Ross London 5380” with Jackson Lister-type limb design, Wenham binocular, helical cut coarse focus, vernier screw/lever fine focus, rotating mechanical stage with x/y controls and integral iris, swinging sub-stage with dovetail recess for technical sub-stage fittings and large plano-concave reflector and lovely bright lacquer finish with just the right time-worn patina.  Offered for sale, this listing presents a rare opportunity for Read More...
20 Sep

~FINE LEAN’S DIAL OF LARGE PROPORTIONS AND RARE SIGNATURE~

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Standing 15 inches tall on three numbered conical feet, this instrument is very unusual in construction and signature. 5 inch (6 inches with bezel) silvered compass signed “Newton, late Willm. Wilton, St. Day, Cornwall”, engine divided into four 90 degree quadrants, and again in complete 360 degree ring with vernier reading to 3″ seconds (scale 0-60) of arc. 8 cardinal points and original cover. Compass dial is perfect-no oxidation. Underside rack and pinion for full rotation and sliding locking bar Read More...
19 Sep

Anesthesia: C1950s Trilene Inhaler

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The Anesthesia Museum describes the apparatus we are offering as an “…Emotril Automatic Trichlorethylene [aka: Trilene] Inhaler by M.I.E Ltd in original metal carrying case. Complete with tubing and mask, Circa 1950. Designed by Hans Epstein in 1949, the Emotril was developed to provide safe and convenient analgesic pain relief during labour. It could ether be self administered or under the supervision of a midwife at home or hospital births.” According to the London Science Museum site:”  Trilene was Read More...
18 Sep

~FINEST 6 INCH GEARED CIRCULAR PROTRACTOR-SCHMALCALDER~

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A rare opportunity to own the finest 6 inch doubly geared 360 degree circular protractor with magnifier, in keyhole (clam shell) shaped flame mahogany case measuring 7 x 7 x 1 inch. Signed in flowing script “Schmalcalder 82 Strand London” All original bright golden lacquer, this instrument is not only unique, it is a 200 year old time capsule. Silvered scale (oxidised with time) with vernier, plotting wings with steel springs and pins, bronze center with cross hairs etched in Read More...
18 Sep

Small size sextant – Cary, London. R.G.S. No 1.

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A small size brass sextant of 6″ radius, the silver scale reading from 0 – 150, the arc engraved, ‘Cary, London. No 909 A, Royal Geographical Society. R.G.S. No 1’. In very nice condition throughout, the mahogany handle with brass lug for tripod attachment. The case measures 21 x 21 cms and has two fastening hooks and brass handle. Cracks to the lid and one to the base. Lock missing. The case holds a short telescope, a sighting scope, a long Read More...
17 Sep

~IMPORTANT SIMPLE THEODOLITE by KIRKWALL/BATE, HERALDIC~

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Doubly engraved “Kirkwall Invenit” and “Bate, London”, this custom designed simple theodolite was made for plane table surveying. Sitting on an 8 x 3 inch brass plinth with four levelling screws and four bevelled, silvered and engraved alignment arrows ( 2 cut outs in base), it is surmounted by an A frame geared telescope in two parts, for storage. 80% original golden lacquer (light spotty wear to top of the scope), the optics are superb and adjusted manually by Read More...
15 Sep

~RARE PLANE TABLE SURVEYING ALIDADE WITH GUNTER’S RULE~

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Designed for use in plane table surveying and trigonometric triangulation, this all brass instrument is extremely unusual. 17 inches long, the alidades are fixed and blocked (similar to the supports used for sundial gnomens). The underside screws are stamped 3(3) and 4(4) so there was no confusion when assembled. Meant to be carried intact (the wooden case would have measured at least 18 x 8 x 2 inches), this instrument has seen little use. I believe it is military ( Read More...
14 Sep

1/5th scale exhibition model of an Archdale MH50 Radial Arm Drilling Machine

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A 1/5th scale exhibition model of an Archdale MH50 Radial Arm Drilling Machine, built in 1998 by Barry Jordan of Derby, England. Height: 65 cm. Width: 51 cm. Depth: 27.5 cm.  With purpose build transport case. With 12 volt power supply.     Barry J. Jordan was born in Derby, England in 1945. He left Joseph Wright Art School at 15, and secured an apprenticeship with Rolls-Royce Aero Engine Division, Derby, in the experimental department. After developing a range of ultrasonic crack detection equipment used in non-destructive Read More...
14 Sep

~FINE AND COMPLETE GYROSCOPE-NEWTON & Co.~

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A fine and complete brass and bronze gyroscope signed “Newton & Co, 3 Fleet Street, LONDON” c.1855 All accessories, some old stringing missing, original inventory description in envelope, some areas of spotting to base but otherwise fine and functional. A marvel of engineering in it’s original pine box measuring 8 x 7 x 5 inches with slide out lid. Newton (William) & Co. were only at the Fleet Street address from 1851-57 according to Clifton. Read More...
13 Sep

A 19 century Daniell’s hygrometer on boxwood stand.

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A 19 century Daniell’s hygrometer on boxwood stand. It consists of a turned boxwood base and stand screwed into the base, with a thermometer on the shaft and a glass tube hanging through the upper part.The double glass tube filled with ether and a bulb at either end, as explained below, contains a second thermometer.In completely original and working conditionThe Daniels hygrometer was invented to measure the relative humidity of the air and was notably used by Admiral Fitzroy during Read More...
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