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TITLE PROOF SLIDE RULE BY J LONG
DESCRIPTION Hand stamped to the edge of this slide rule is the makers name J Long. 20 Little Tower Street London. From this we can date the rule between 1821 and 1884. The rule is marked "Over Proof" "Proof" and "Under Proof". It also has a "Thermometer Scale." Made of boxwood with brass tips the single centre slide can be moved easily.
DATE 1821-1884
PRICE £115-
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STOCK NO. 17251
DIMENSIONS
cm
  23 x 4
inches
  9 x 1.5
 
 
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