Laboratory exercises in physics for secondary schools (1902)
Twiss, George Ransom, b. 1863 · New York, London, The Macmillan company · leaf 141
first and third posts throw in the first two coils, the second and fourth posts the last two coils, and the first and fourth posts all three coils.Usually, the connections are so chosen as to give the needle a deflection of about 45°, because with that reading the errors are smaller in proportion… … Fig. 28. —Commutator. Thewires leading from the galva-nometer are inserted at posts GG,and those leading from the cur-rent circuit at posts CO, MAGNETISM AND ELECTRICITY 113 switch, is provided. A convenient and inexpensivedevice is shown in Fig. 28. The connections are made as shown, by wires…
Physics
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