Four Holtzapffel Measuring Instruments, London, 19th century, a steel...

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Source SKINNER AUCTIONS, Boston & Marlborough, MA, USA

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Description

Four Holtzapffel Measuring Instruments, London, 19th century, a steel protractor calibrated 0-90-0 with damascened 6-in. brass arm marked Holtzapffel Co. London; steel caliper with brass central pivot joint marked Holtzapffel & Co; a 40-degree protractor on a 6-in. brass arm; and a lacquered brass rule marked Scale of Centres inside...

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