Guide to the Practical Elements of Electrical Testing
Guide to the Practical Elements of Electrical Testing
J Warren
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25, wheie A consists of a flat brass spring, mounted at one extremity on an ebonite block or insulating pillar B, and free at the opposite extremity as regards its ver- Digiti zed by G00gk 60 tioal movements within certain limits, which enable it to " make " and " break " contact at will with the stud C, which is platinum tipped, as well as the corresponding point on the spring, in order to reduce the electrical resistance due to oxidation at the point of contact. D is a finger piece used to de...press the spring, and it is generally provided with a locking device E, engaging with * - w , E£ ,B I Fig. 25. the stud F, which enables the operator to leave the key closed for any required period. H is one of the ter- minals, the remaining one being in a line with it, and therefore not seen in the figure. They are, of course, connected with the spring A and the stud C respectively. The Short-Circuit Key. — This is an extremely useful key, and is essential to the safe working of all sensitive galvanometers.
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