- Sold for:
- Clocks, Watches & Scientific Instruments - 2345
- Date / Time :
- July 29, 2006 10:00AM
Drafting Instruments, a brass parallel rule with protractor by Wm. Helfrfricht, Philadelphia; a French brass sector; a 9 1/4-inch brass parallel rule with engraved links and central rosettes; a 15-inch ebony parallel rule with shaped brass links, in mahogany case; and a brass full-circle protractor, with two scales of degrees divided 0-90 in four quadrants and 0-360, dia. 6 in.