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
Scale by Ertel
Collection of links regarding scientific instruments in the Web: https://www.pinterest.com/geometricum/scientific-instruments-in-the-web/