Johnston, Philip Devereux, 1855- · New York, D. Williams Company · leaf 16
ment of the shank in the socket,and every good instrument should stand the test. The compass with fixed needle point and interchange-able pen and pencil points and lengthening bar is prob-ably the most convenient instrument, as the steel pointsare only of use when the compasses are employed… … COMPASS IN POSITION FOR TESTING ALIGNMENT. rigidity in all positions. All joints should move in oneplane; the shanks of the several points should beproperly fitted, and the workmanship should be perfectthroughout. The finish should be put on with care, andthe instruments should not have a glossy…
Mechanical drawing
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