05-01-201005-01-2010
Skinner Auctions
Skinner AuctionsMarlborough MA
May 1, 2010 10:00 AMCalender
723

Protracting Parallel Rule

Sell one like this
$770$650
Auction: Clocks, Watches & Scientific Instruments - 2502Location: MarlboroughDate / Time: May 01, 2010 10:00AM

Description:

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.
Estimate $400-600

no significant repairs or replacements, instrument in old cleaned surface.

Keywords

Philadelphia, William Helffricht