Chapter 3 Part 17
An adjustable spark-gap, as illustrated in Fig. 39, may be interposed in the secondary circuit for the same purpose of cutting out inverse currents, and is so used commonly with static machines. For heavier currents, as from coils, this is a somewhat noisy working arrangement; but such an arrange- ment as is shewn in Fig. 39 allows much more easy regulation and the valve-tube is interposed on that side. Fig. 38 shews the arrangement diagrammatically, but in practice the valve- tube should be interposed, as in Fig. 40, between the coil and the sparking pillars, otherwise the alternative spark will measure the resistance of the valve-tube in addition to that of the X-ray tube, and thereby convey a false idea of the condition of the latter. Readings on a milliamperemeter placed in the secondary circuit show that this action is more than theoretical, and
The use of the spintermeter and milliamperemeter in the secondary circuit of the coil has already been explained, and the annexed diagram (Fig. 40) shews their arrangement during operation.
Hammer Break.
Since the efficient working of an induction-coil depends in so large a degree upon an intelligent understanding of its principle and construction, we have on request decided to add here, as in the case of accumulators, some more theoretical and detailed instructions to workers.
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