Three card Slide Rules
£150
Circa
1916
Country of manufacture
UK and Ireland
Description
A card slide rule for horse power calculations, advertising Lambeth cotton rope, ink owners signature. Fuel Cost calculator published by Meldrum Brothers and advertising “The Meldrum Forced Draught furnace.” ink signed for owner. The Lambeth Cotton Driving Rope Horse Power Calculator, ink signed for owner. Reverse has hints on designing a rope drive. All three in overall good condition but slightly grubby through age. In an original but scruffy leather pouch.
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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.
