$615
Four Holtzapffel Measuring Instruments, London, 19th century, a protractor calibrated 0-70-0 with tightening screws on rear, marked Holtzapffel & Deyerlein London ; 4-in. caliper with brass slide calibrated 0-10; depth gauge marked Holtzapffel & Deyerlein London , with steel knife edge and knurled lock-down screw; and a 4-in. dual knife-edge parallel calipers with scale reading 1-4.
Auctioneer:
Skinner
Date:
2017-04-28