Sold for:
$523
$523
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.
Auctioneer:
Skinner
Date:
2017-04-28
