Sold for:
$770
$770
Protracting Parallel Rule, William Helffricht, Philadelphia, the parallel rule with "S" hinges, lower section with engraved index, the upper engraved Wm. Helffricht Maker Philada , protractor engraved with degrees and index arm with vernier, maximum lg. 11 1/2 in. no significant repairs or replacements, instrument in old cleaned surface.
Auctioneer:
Skinner
Date:
2010-05-01