e will be a right and a wrong way of con-necting up. In the former the direction of the current from themain will be opposed to that of the battery, the lamp will burnmore dimly, and the battery will receive a charge. In the latter itwill not receive a charge, but, on the contrary, it will… … Fig. 31.—Charging through a Lamp-Resistance (Biggs and Co.). mined the ends may be marked in some way for future guidance.Another way of testing the polarity of the ends of wire is to uselitmus-paper; the paper will be reddened where it touches thepositive pole, and turn blue where it touches the…
X-rays · Radiography
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