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 the Pitch Circle/Holtzapffel & Co. London/Professor Willis's Odontagraph, scale calibrated 40-210 on outer edge.
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 the Pitch Circle/Holtzapffel & Co. London/Professor Willis's Odontagraph, scale calibrated 40-210 on outer edge.
Try LotSearch and its premium features for 7 days - without any costs!
Be notified automatically about new items in upcoming auctions.
Create an alert