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.
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.
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.jpg "Source: Christie's")
.jpg "Source: Christie's")
