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~EXCELLENT FLIP TYPE TRIAL LENS PAIR OPTOMETER~

An excellent 8 inch paired, flip type trial lens set/optometer with French ivory handle c.1920. Perfect lenses marked +/- 0.25, bright nickelled steel square shaft, flawless handle. Minor corrosion to the hilt (see photo). marked AO (Aloe? American Optical?)? At least 100 years old. Great display piece for the optometrist. Read More...

~UNUSED FILAR EYEPIECE MICROMETER-SPENCER, BUFFALO~

New old stock filar eyepiece micrometer by Spencer, Buffalo in original card case with pivoting lock. Never used, labelled “Spencer, Buffalo, Orthoscopic, 10X” this black enamel and stainless/bright/nickel steel accessory is the finest you will see for some time. No flaws and cased. c.1930-50.  Vernier. Hairs intact. Case is 4 x 2 1/4 x 2 1/4 inches. Collar ID is 24 mm. (slightly variable to 1 inch). Read More...

Two Stylus Driven Addometer Calculators

The AS Lineal calculator, made in Germany and retailed by Berville,18 Rue de la Fayette, Paris-in good working order, in original case, with stylus, with zero reset handle. The Addometer, Regd U. S Patent Office-in good working order, in original case with stylus, for financial sterling calculations up to £9,999. This example retailed by Taylor’s, 74, Chancery Lane, London Read More...

The Sum-Up Slide Rule, The New Amazing Slide Rule

“Your Calculations made a Pleasure Instead of a Headache”-Uncommon American Slide rule in good condition with original envelope and paper instruction sheet-adds,subtracts,converts fractions of an inch, decimals of an inch, millimeters. Made by the Sum-Up Slide Rule Co. New York. Read More...

The Lightning Portable Adding Machine with Automatic Clearance

An example of the Lightning Adding Machine in unused condition, with original box,instructions, stylus and desk stand-made by the ‘Lightning Adding Machine Co. Inc Los Angeles, California Read More...

The Personal Account Indicator or Perpetual Balance Sheet

A charming and rare card ready reckoner in good condition noting some pencil annotations and some staining on each set of discs from contact with metal rivets Read More...

Three Stylus Driven Calculators

“The Golden Gem”- serial number 30005, marked “Pat. Mar. 1-04-Mar 2-06 Mar 19-07” and “Automatic Adding Machine Co. New York, USA -no stylus In good working order The Standard Desk Calculimeter,marked on side “PAT DEC 17’01-in reasoble condition, some of the dials a bit sticky-quite an uncommon calculator-American-no stylus The ‘Brical’ English money adding calculator in good condition in original case with stylus   Read More...

Palmer’s Computing Scale

An example of Palmer’s Computing scale,heavy duty card in good condition-with a rather scruffy but complete set of paper instructions. The cover is very distressed and and the spine is detached. inserted in the cover is an unrelated chsrt ‘analytical table of mechanical movements’. The cover is embossed ‘Fuller’s Computing Telegraph’ Read More...

The Webb Adder

An example of the first version of the Webb adder-stylus driven but missing the stylus otherwise in good working order Read More...

Soresi’s 1924-5 Patent Blood Transfusion Apparatus

A rare example of Soresi’s arm-to-arm transfusion apparatus, for which he held two patents (see links below): one issued in 1924 and the other in 1925. Unlike the Braun apparatus, which was produced in large quantities for the German military during WW2),and which we see frequently offered on the Internet , the Soresi apparatus was not widely used by the US military and few examples seem to have survived. The one we are offering is largely complete, as a Read More...

Early brass Stadimeter, WWI era – Keuffel & Esser Co, New York, 1918

Early stadimeter made of brass in full working order. It’s complete with box of mahogany and adjustment instructions in the lid. That the instrument is made of untreated brass, the case is made of mahogany and the no. 352, indicates that it is a very early instrument. Felt has not yet been used.  The stadimeter or optical range finder, was developed in the 1890s by Bradley Allen Fiske and designed to determine the distance to other warships. Like a sextant, Read More...

Dr. Butler’s 1881 Patent Electro-Magnetic Device for Medical Use

Dr. Butler’s Patent “Electro-Magnetic Device for Medical Use” was granted a US patent on February 1, 1881. ( pat. 237,167)–see last image. This example appears to be working but it would benefit from a little loving care. There is also a superb example of this device  on Fleaglass but there is a very substantial price difference between the two. Our example is probably bit earlier, as evidenced by the fact that handle is as shown in the patent drawing.  Read More...