Allen, Charles Ricketson, 1862- [from old catalog] · New York, H. Holt and company · leaf 239
substitute may be used ; the latter is just as good, as the instru-ment is always inserted in the circuit between others. When … the wires leading to the instrument are connected with twodiagonal holes, and the wires leading from it with the other two,on filling the holes with mercury, and inserting the X, the CONSTRUCTION OF APPARATUS. 227 current will pass as shown in Fig. 110: on lifting the X,turning it half round, and…
Physics
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