A natural philosophy : embracing the most recent discoveries in the various branches of physics, and exhibiting the application of scientific principles in everyday life .. (1899)
Quackenbos, G. P. (George Payn), 1826-1881 · New York, Cincinnati [etc.], American book company · leaf 365
ed,and the circuit is completed.On removing the hand, theknob springs up, the circuit isbroken, and the current ceases.If the knob is kept presseddown, the paper at the otherend is indented with a contin-uous line; but by tapping onit so as to form different com-binations of dots and dashes,which… … THE SIGNAL KEY. operation. What was formerly connected with the machinery ? Why is it now dis-pensed with? Instead of carrying hoth wires over poles from the electro-magnet tothe battery, what is now the more usual arrangement ? How is the earth made toform half of the circuit ? 917. What is the…
Physics
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