Drawing instruments have been essential to mathematics, architecture, surveying, navigation, engineering design, and other technical endeavors from antiquity through the 20th century, although ...

1) A 4" brass semicircular protractor, divided to single degrees and numbered by tens in both directions from 10 to 180. It is marked: Butterfield AParis. 2) A 6-3/4" brass folding combination set ...

Who could imagine you could draw musical instruments on normal paper with any pencil and then play them with your finger? It is an electronic pencil that lets you make music while you draw. Their ...