The book Telephone Lines And Their Properties was written by author Hopkins William John Here you can read free online of Telephone Lines And Their Properties book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Telephone Lines And Their Properties a good or bad book?
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A method of easily obtaining the com- parative volumes of different sounds is by the use of the apparatus described below : This apparatus, as originally designed,* depended for its operation on the finding of the point of dis- appearance of the sound in a secondary coil as it was moved away from the coil carrying the current to be measured. Through a fixed coil, C, at one Iffl I I I! ] I I! M I I M I I I I I 1 i end of the balance, the current to be meas- ured was passed, i-i The movable coil,... D, was then moved away I from C, until the point was reached at which "=^ the sound just disap- peared ; and this position was read off on the graduated scale at the side. There are, obviously, many difficulties in the way of the practical use of such an instrument. The point of apparent disap- pearance of the sound will depend on the acute- ness of hearing of the observer, on the degree of quiet that could be obtained in the room, and there is a considerable range in which it is difficult to tell whether any sound is heard or not.
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