Kueffel and Esser Co. Alidade Model T-211618 In Original Case Crystal Clear Optics in a carefully owned and used instrument From the dry, high desert climate of Colorado It is rare indeed to find deca

 

A lovely pair of antique victorian gold gilt/plated and tortoise shell handled folding spectacles/glasses. Spring action still works to open and close lenses. Width is 8.8cm left outer lense to right

 

Mandell store Mannheim Trig Acu-Math 90A Magnesium Slide Rule I'm a guy who looks for stuff to sell. I endeavor to provide timely service and to describe all items accurately. Every item is sold as-is

 

FREE SHIPPING!! The Kit Includes: 2 - 10" Green Gold Pan - The GREEN color contrasts the BLACK sand and the GOLD in your pan. 2 - Suction Tweezers - Suck up the fine gold and move it to your storage v

 

Highly unusual and rare 1966 Keuffel & Esser vintage ANALON ENGINEERING-SCIENCE ANALYSIS SLIDE RULE - with case and Instruction Manual. One of the rarest of K&E slide rules and one that utiliz

 

Thiourea is also known as thiocarbamide. White, lustrous crystals with a density of 1.4 and a melting point of 180 degrees Celsius. Soluble in cold water. It's uses include - photography (removing sta

 

This is a Vemco V-Track drafting machine used in a land surveying office. It is in very good condition and good working order. It includes 6 scales- 10/50, 20/40, 30/60, and 2 inches and metric. See p

 

This is a newly crafted vintage style tumble chamber kaleidoscope created in my studio in the Black Hills of South Dakota. It is a one of a kind cast solder and art glass dry chamber kaleidoscope. As

 

Here is a very nice vintage German made drafting set. It is complete, and has spare tips, and leads. No rust, the felt and the case is is great. Shipped via USPS Priority Mail. This will make a fine a

 

Curta Type II 2 Mechanical Calculator, # 546758. This Curta Calculator is in Pristine condition and appears to have been rarely used. It comes with the original plastic case and box with serial number