Both English, comprising of Glaser's Textile Conversion Slide Rule, c.1905, patented 1903, no. 242, with twin slides and fixed celluloid cursor, 64cm; with Thomlinson's Equivalent Paper Slide Scale, c.1920 twin slides, boxwood mounted on mahogany 58.5cm
Sold for £150
Result plus buyers premium
Both English, comprising of Glaser's Textile Conversion Slide Rule, c.1905, patented 1903, no. 242, with twin slides and fixed celluloid cursor, 64cm; with Thomlinson's Equivalent Paper Slide Scale, c.1920 twin slides, boxwood mounted on mahogany 58.5cm
Auction: Fine Scientific and Medical Instruments, 12th May, 2022