This is a 500-ml borosilicate glass flask (round bottom flask or boiling flask) that has been sealed, pumped to high vacuum, baked out, and backfilled with xenon gas to a pressure of 90 torr. When exp

 

I smashed my thumb too many times to count! Ever had a small ore sample you tried to breakup with your hammer on the trailer hitch of your truck or on another larger rock and hit your self or had flyi

 

Vintage Pickett N 3-ES SLIDE RULE Power Log Exponential Dual Base in Hard Lined Leather Case. This slide rule is in very good to excellent condition, no major issues of any kind, straight, good corner

 

VINTAGE K & E SLIDE RULE POLYPHASE NO. N4043-3 MADE IN USA GREAT CONDITION WITH CASE ORIGINAL BOX INCLUDED BOX TOP HAS SOME WRITING UNDER COVER NO BREAKS FUNCTIONS PERFECTLY LOW STARTING BID OF ON

 

Clear glass cup to wash your eye.no chips cracks. Perfect condition.

 

Keuffel & Esser Compensating Polar Planimeter 4242 Good condition. Serial #13158 Comes in fitted case and box with 2 manuals and a paper with factors for scale drawings or maps. Outer box is prett

 

This is a vintage Welch Allyn Opthalmoscope Otoscope set in a bakelite case. It comes with everything you see in the pictures. It has general wear to the set. It is being sold as is, untested. *****We

 

Please scroll down for lots of photos. Vintage Metal Dental Molds - Lot of 29 Fresh from a Dallas estate comes this group of 29 dental molds. These appear to be of several manufacturers including 12 R

 

Vintage OTIS KINGS BRASS & CHROME CALCULATOR in CYLINDRICAL FORM, Folding Firstly... to really appreciate the item you need to ENLARGE the photographs...left mouse click ...they may look a differa

 

Up for auction is an Atlas Powder Company non-electric blasting cap box (box is empty) It is a #6 cap box that was 100 count. It measures 2.5X2.25X1.5 inches. This is a no reserve auction. Please ask