Photographs, Optical Toys & Science
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Lot 289 - A Roberts Sliding Gunter Rule, Nairne & Blunt, London
Lot 293 - W & S Jones, A Rare & Important 24" Soho Scale Rule
Lot 297 - English Chemical Equivalents Slide Rule after Wollaston, hydrogen-scale variant
Lot 302 - Unusual Brass Rule Engraved with Symbols
Lot 303 - 19th Century Comparative Measures Rule or International Measures Rule
Lot 306 - Unusual 4 Slide Guager Rule, Edward Roberts
Lot 309 - 2 Ganga Ramm's Patent Slide Rules By Holtzapffel & Co. London
Lot 331 - Philips Photographic Exposure Meter, Slide Rule
