This slide rule is used to calculate dew point andrelative humidity 11 inches in diameter and 20 scales

 

Inscribed on back is: Dr P B Rose 1984. Marked with makers name: BIRKS GF . On the front : CANADIAN MEDICAL ASSOCIATION SENIOR MEMBER - FOUNDED AD 1867 . Excellent condition, very clean, as found. No

 

This is a fantastic piece and apparently quite rare as well. It was most likely a giveaway advertising piece from the service garage in Schuylkill, PA identified in the photos. It is made of brass and

 

ENGLISH BAROMETERS OF 1680-1860 HCDJ-FIRST EDITION 1968 BY: NICHOLAS GOODISON A History of Domestic Barometers and Their Makers. Contains 353 pages and is in very good to excellent condition other tha

 

RARE EXCELLENT CONDITION UNUSUAL SHAPE HANGING BAROMETER TEMP GUIDE WHAT YOU SEE IN PICS IS WHAT YOU SHALL RECIEVE PLEASE PAY WITHIN 3 DAYS OF WINNING BID VIA PAYPAL INTERNATIONAL BIDDERS PLEASE REQUE

 

THIS CARBIDE LAMP COMES WITH THE RUBBER BUMPER GRIP.THE FLINT STILL THROWS SPARKS IN THE SMALL 2 1/2 INCH REFLECTOR.THERE ARE A COUPLE OF DENTS IN THE BOTTOM PIECE ABOVE THE RUBBER BUMPER AND THE REST

 

For bid is this BRASS JUST RITE coal miners lamp.The top is clearly marked JUST RITE. Bottom states United States Of America. Considering it's age the 4 '' reflector looks pretty good but you be the j

 

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

 

Here is a recent estate sale find ... up for auction is this Vintage Keuffel & Esser (K & E) Compass with Level, Solid Brass Case with Folding Arms and the Brass Tripod Adapter. The compass me

 

Item: Vintage DETECTRON COMPANY Geiger Counter Radiation Detector w Utah Headphones Condition: As Is, untested. All items are considered used and sold "As Is", there are no guarantees. You get what is