Unusual Boxwood Slide Rule “Collins Milk Scale”
£140
Dimensions
6.25 inches
Circa
1900
Maker
Brady and martin
Country of manufacture
UK and Ireland
Description
Collins Milk Scale, a boxwood slide rule made by Brady and Martin, Newcastle-on -Tyne, inked owners name. Scales for temperature, Lactometer reading for specific gravity and a Gerber scale (primary and historic chemical test to determine fat content}
Ask the Dealer
Dealer information
Fletcher
Fletcher Wallis
Fletcher Wallis sells objects and books relating to the history of science, medicine and technology Arcade. He publishes books through Vernier Press, including Antique Medicine Chests, and Corkscrew Patents from 1795. He has been dealing for forty eight years.
