Laboratory exercises in physics for secondary schools (1902)
Twiss, George Ransom, b. 1863 · New York, London, The Macmillan company · leaf 212
axis. Three support blocks are fittedto the rule, as shown. The rule fits into the rec-tangular groove, its upper surface being flush withthe upper face of the block, which is held in place bytwo stiff rubber bands. Wire nails are stuck uprightinto the block, and over them at top and bottom… … Fig. 45. — Rule and support blocks, mounted in a clamp so that theymay be turned in any direction. Two double convex lenses, unmounted, and eachhaving a focal length of from 10 to 20 cm., and a con-cave lens, are provided. Operations. — (a) Slip the blocks, A and i?, on tothe rule. Place a double…
Physics
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