The telephone: an account of the phenomena of electricity, magnetism, and sound, as involved in its action by Dolbear A

Author:Dolbear, A[mos] E[merson], 1837- [from old catalog]
Language: eng
Format: epub, pdf
Tags: Telephone. [from old catalog]
Publisher: Boston, Lee & Shepard; New York, C. T. Dillingham
Published: 1877-03-25T05:00:00+00:00

These numbers are to be interpreted thus: Suppose that we have a tuning-fork giving 256 vibrations per second: the sound will be that of the standard or concert pitch for the C on the added line as shown on the staff. Now, D when properly tuned will make 9 vibrations while C makes but 8; but, as C in this case makes 256, D must make 256 X | = 288. In like manner G is produced by 256 X 1 = 384, and C above by 256 X 2 1=512, and so on for any of the others.

If other sounds are used in the octave above or below this one, the number of vibrations of any given note may be found by either doubling or halving the number for the corresponding note in the given octave. Thus G below will consist of a|± — 192, and G above of 384 X 2 = 768.

During the past century there has been a quite steady rise in the standard pitch, and this has been brought about in a very curious and unsuspected way. The tuning-fork has been the instrument to preserve the pitch, as it is the best available instrument for such a purpose, it being convenient to use, and does not vary as most other musical instruments do. But a tuning-fork is brought to its pitch with a file, which warms it somewhat, so that at the moment when it is in tune with the standard that fS being duplicated it is above its normal temperature; and when it cools its tone rises. When another is made of like pitch with this one, the same thing is repeated ; and so it has continued until the standard pitch has risen nearly a tone higher than it was in Handel's time.

The common A and C tuning-forks to be had

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