Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 173
with platinum tips to pre-vent corrosion, and, if possible, a slight sliding action at the point ofcontact is also obtained. A sliding contact tends to clean thepoints and at the same time prevent particles of dust from keepingthe two apart. Too much sliding action is, however, worse thannone, as… … FIG. 128.—SERIES DESK SET CIRCUIT—COIL ON RACK. their elastic limit or to such a degree that they will eventually losetheir tension or break. It is bad practice to have the same part ofa contact slide alternately over a conducting material, as of brass,and an insulating material, as of hard rubber,…
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