The Journal of laryngology and otology . s so much lower too is the nextquestion. Because the sound gets so much lower by the pressureof the water, it does not necessarily imply this. Dr. Kayser, closing the discussion, said: It is a well-knownfact that the tuning-fork loses in height under water, but I do notknow whether it is as much as an octave. However, with the tele-phone under water this could be easily proved. The tuning-fork isbrought to sound under the water, and the receiver on the otherend will give undeniable evidence. The lowering may be a fifth,but hardly an octave. The human vo
The Journal of laryngology and otology . s so much lower too is the nextquestion. Because the sound gets so much lower by the pressureof the water, it does not necessarily imply this. Dr. Kayser, closing the discussion, said: It is a well-knownfact that the tuning-fork loses in height under water, but I do notknow whether it is as much as an octave. However, with the tele-phone under water this could be easily proved. The tuning-fork isbrought to sound under the water, and the receiver on the otherend will give undeniable evidence. The lowering may be a fifth,but hardly an octave. The human voice is not influenced. Itmay be difficult to prove that actually, but so far I could not findany evidence of it. A New Optic Method of Acoumetry. By Professor GiuseppeGradenigo (Turin). If we paint at the end of one of the branches of a tuning-forkwhich vibrates with sufficient amplitude a distinct figure (say a talltriangle), this figure will appear more or less doubled. Theduplicate images will overlap, the overlapping part being very. Fig. 1. distinct in outline and colour {field of double image), while theseparate portions will be much paler and less distinct in outline{field of single image). As the vibrations diminish in amplitudethe field of double image becomes greater—the two images 584 The Journal of Laryngology, [November. 1899. gradually merging into one. The growth of the field of doubleimage corresponds to the diminution of the amplitude of the vibra-tions of which it thus becomes a measure {vide Figs. 1, 2, 3, 4).
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