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Title: Set of 18 plug gauges for Messrs. Holtzapffel's screw thread [Go to resource]
Description: Set of 18 plug gauges for Messrs. Holtzapffel's screw threads, sizes D to U. Made in London, c.1850. License: http://creativecommons.org/licenses/by-nc-sa/2.5/ Subjects: gauges Temporal: c. 1850 Source: Science Museum Creator: Holtzapffel & Co Identifier: 1999-190 Go to resource More Like this...
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