In the past few years I have built up a collection of old books and technical instruments from the 15th to 18th Century. It's now time to sell my collection.
Dividers, Drawing Instruments, Surveying Instruments and others.
Sold objects are listed here
Practical Geometry, Surveying, Tables
Complete book collection is sold
Scale by Ertel
Iron divider, 18th century with very nice decoration, New silver divider by Kern, Aarau see for details