Abstract
DRAUGHTSMEN and students of engineering will find this curve ruler a useful addition to their stock ot instruments. The instrument consists of a trans parent strip of celluloid, which may be bent to fit any given curve, or to pass through a series of plotted points. The strip is clamped to two slotted brass bars, one of the clamps forming a swivel, which may be locked at any horizontal angle. The slotted bars may be clamped in any position and at any angle to a slotted wooden bar, which holds the whole appliance. Two other slotted brass bars may be clamped to the wooden bar in any position, and have hooks formed at the outer ends; these assist in bending the celluloid strip into the proposed curve, and give steadiness to the strip. Two celluloid strips are supplied, one about 0.05 and the other about 0.1 inch in thickness.
The “J.R.B”. Patent Adjustable Curve Ruler.
(London: W. H. Harling.) Price 7s. 6d., 10s., and 12s. 6d.
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The “JRB” Patent Adjustable Curve Ruler . Nature 89, 477 (1912). https://doi.org/10.1038/089477a0
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DOI: https://doi.org/10.1038/089477a0