Merchant, F. W. (Francis Walter), 1855-1937, Chant, Clarence Augustus, 1865-1956 · Toronto : Copp Clark · leaf 23
plate can be moved by screws with graduated heads, muchas in the wire gauge. There are other devices for accurate measurement of lengths,but in every case the scale, or the screw, or whatever is theessential part of the instrument, must be carefully comparedwith a good standard before our… … This is usually a sharp steel edge resting on a steel or anagate plate. The bearings at G and D are made with very little friction, so thatthe beam turns very freely.A long pointer P extendsdownwards from the middleof the beam, and its lowerend moves over a scale 0.When the pans are balancedand the…
Physics
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