Laboratory exercises in physics for secondary schools (1902)
Twiss, George Ransom, b. 1863 · New York, London, The Macmillan company · leaf 163
distance telegraph line of two stations, todiagram the arrangement, to trace the currentthrough the circuit, to operate the instruments, andto explain their action. Apparatus. — (a) Call the two stations A and B.At each station there should be one gravity cell, onekey, one sounder, some pieces of… … Operations. — (a) At one station, e.g. A, connectthe — electrode of the battery cell to a wire leading from a gas pipe orwater pipe. Bothwire and pipeshould have beenfiled till bright, andthe wire tightlywound a half-dozentimes round the Fig. 35.—Morse Key. pipe, or still better,soldered to the…
Physics
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