~UNUSUAL SIX INCH BONE ROLLING RULER-BERGE, LONDON~
200 GBP ( $260 USD)
An unusual 6 inch bone rolling ruler by Matthew Berge c.1800
6 x 1 3/4 inches ( 15 x 4 cm.)
Country of manufacture
UK and Ireland
With the exception of a few missing screws (stable as it is also pinned at both ends), this unusual rolling rule is in fine overall condition. Having the usual scales of proportion/ratio on the back and a protractor with an additional scale marked CHO (chords) on the front, it does NOT have the later scales for the trigonometric scales of RUM, SIN, TAN, etc. Also, the roller function (in brass and steel) does NOT cut through the ruler as in later examples such that it can only be used for rapidly drawn lines whilst inverted (at an angle of 5-10 degrees). This may have been an apprentice piece by Ramsden’s future foreman ???? Signed M. BERGE*LONDON, it is a rare example of this style of bone rolling ruler.
Ask the Dealer
Mark Hacking (Scientifica Opticae Inc.) has been an avid collector/dealer for over 30 years. A former Science teacher, he has an innate love for anything natural or mechanical. Specializing in optical (microscopes, telescopes), surveying, medical, weighing and drawing instruments, he is an active participant of the Scientific Instrument Fair in London. Living in Stratford, Ontario, Canada, with his wife and two children; Mark looks forward to meeting as many fellow collectors as possible, and has a worldwide following on eBay (Sciopti).
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