Sketch of Prof John Le Conte And Sensitive Flames And Sound Shadows

The book Sketch of Prof John Le Conte And Sensitive Flames And Sound Shadows was written by author W Le Conte Walter Le Conte Stevens Here you can read free online of Sketch of Prof John Le Conte And Sensitive Flames And Sound Shadows book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Sketch of Prof John Le Conte And Sensitive Flames And Sound Shadows a good or bad book?

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i8 SENSITIVE FLAMES AND SOUND-SHADOWS.
But there is now no longer any necessity to resort to such dangerous sources of sound as dynamite. Whistles may be made which yield tones exceeding twenty thousand vibrations per sec- ond. The wave-length corresponding to such a pitch is less than an inch. The advantage presented is that the sound is continu- ous, and it may be made as constant as we please by supplying the whistle from a cylinder full of compressed air, regulating the pressure by means of... an appropriate gauge. The disadvantage is that the intensity is but slight, and the pitch is too high to be perceived as sound by most persons unless the ear is closely ap- plied. An artificial indicator must hence be used, whose motion under the disturbances due to sound can be seen at a distance.
In 1857 Prof. John Le Conte discovered that an ordinary naked gas-flame, from a fish-tail or bat-wing burner, becomes an indicator of sound by vibrating in unison with an external source, provided the pressure be such that the flame is just ready to flare.

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