. The Bell System technical journal . as shown in Fig. 1. mately the loudness of any sound. The result of using such a devicefor recording the variations of loudness in the spoken sentence whichwe have been discussing is shown in Fig. 3. For comparison, thevariations in pitch are also shown in this figure. If the fifteen-hundred-foot wave carrying the sentence abovementioned could all be collected into an energy collector, the question 258 BELL SYSTEM TECHNICAL JOURNAL arises, How much energy would be involved? It is not possiblehere to describe the devices by which we were able to measure acc
. The Bell System technical journal . as shown in Fig. 1. mately the loudness of any sound. The result of using such a devicefor recording the variations of loudness in the spoken sentence whichwe have been discussing is shown in Fig. 3. For comparison, thevariations in pitch are also shown in this figure. If the fifteen-hundred-foot wave carrying the sentence abovementioned could all be collected into an energy collector, the question 258 BELL SYSTEM TECHNICAL JOURNAL arises, How much energy would be involved? It is not possiblehere to describe the devices by which we were able to measure accu-rately the energies and frequencies involved in speech, but the resultsof this research work are interesting. When this sentence is spokenfairly rapidly, it will contain about two hundred ergs of 500,000,000 ergs of energy pass through the filament of anordinary incandescent lamp each second. This shows that the acoustic ;!: o o ? Q. %. 0 ^. / \ L/ \ ^ ,w a : r \/ \ v \ ^ A / / X\ II \ / \ \ t. Fig- ^—Graph of the loudness of the various sound elements when the sentenceJoe took Fathers shoe bench out is spoken. energy in this sentence is very small. Putting it in another way, itwould require five hundred persons speaking this sentence continuouslyfor a year to produce sufficient speech energy to heat a cup of tea. An examination of the wave produced by this sentence shows thatthe vowels contain considerably more energy than the measurements have indicated that in ordinary conversation theratio of the intensity of the faintest speech sound, which is th as inthin, to the loudest sound, which is aw as in awl, is about one SCIENTIFIC RESEARCH APPLIED TO THE TELEPHONE 259 to five hundred. The actual power used in producing the varioussounds depends, of course, upon the speaker and the emphasis withwhich he pronounces the sound. The power in an accented syllableis three or four times that in a similar unaccented syllable. Me
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