18th Oct, 2019 12:00
Fine Photographica & Instruments of Science & Medicine
A large Ivory Excise Officer's Slide Rule
English, c. 1890, by T. O. Blake Ltd, double sided with two slides, with scales for calculating alcohol duty, scales for over and under proof, duty in shillings, barrel scales including segment standing, segment lying, spheroid and 2nd variety, length 32.2cm.
English, c. 1890, by T. O. Blake Ltd, double sided with two slides, with scales for calculating alcohol duty, scales for over and under proof, duty in shillings, barrel scales including segment standing, segment lying, spheroid and 2nd variety, length 32.2cm.
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Auction: Fine Photographica & Instruments of Science & Medicine, 18th Oct, 2019
