Laboratory exercises in physics for secondary schools (1902)
Twiss, George Ransom, b. 1863 · New York, London, The Macmillan company · leaf 139
ofthe telescope, and if the image of the scale is notclear, the telescope must be carefully focussed bymeans of the draw-tube. Finally,* the telescope, thescale, or the coil (depending on the make of instru- 110 LABORATORY EXERCISES IN PHYSICS ment) is swung a very little to the right or left… … Fig. 25.— DArsonval Galvanometer, with sight and scale attachment. side of it, and just, on a level with the top edge ofthe scale. You will see a reflection of the scale inthe suspension mirror. Also, above this image of thescale there will appear in the silvered upper half ofthe cover glass the…
Physics
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