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pro vyhledávání: '"Derwent M. A. Mercer"'
Autor:
Derwent M. A. Mercer
Publikováno v:
The Journal of the Acoustical Society of America. 23:45-54
The art of “voicing” an organ pipe, that is, treating it in order to produce a satisfactory musical tone, is highly developed, but on an entirely empirical foundation. Flue pipes only are dealt with here, chiefly the open diapason, an open metal
Autor:
Derwent M. A. Mercer
Publikováno v:
American Journal of Physics. 21:376-386
This is a review article in which the physical principles underlying the function of the organ flue pipe are considered. Many of the points are not understood, and attention is called to them as possible lines of investigation. A survey is made of th
Autor:
Derwent M. A. Mercer
Publikováno v:
Cold Spring Harbor Symposia on Quantitative Biology. 25:73-86
Autor:
Kenneth W. Goff, Derwent M. A. Mercer
Publikováno v:
The Journal of the Acoustical Society of America. 27:1133-1141
A probe microphone has been developed suitable for measuring sound fields within such structures as altitude wind tunnels and jet engine test cells. This paper describes the methods of testing and analyzing the instrument. The microphone consists of
Autor:
Derwent M. A. Mercer
Publikováno v:
The Journal of the Acoustical Society of America. 43(3)
The use of the single dBA level as a hearing‐damage criterion was stated by Flanagan and Guttman [J. Acoust. Soc. Am. 36, 1654–1658 1964)] to be inapplicable. It is shown by consideration of a number of industrial noise spectra that dBA levels ca
Autor:
Derwent M. A. Mercer
Publikováno v:
Nature. 224:1001-1002
Autor:
Derwent M. A. Mercer
Publikováno v:
The Journal of the Acoustical Society of America. 27:209-209
A number of measurements have been made of middle C open diapason organ pipes during variation of the voicing adjustments. The effect on the spectrum and on the initial transient of alterations in height of mouth, languid setting, and wind pressure a
Autor:
Derwent M. A. Mercer
Publikováno v:
The Journal of the Acoustical Society of America. 27:1014-1014
The noise output of turbojet engines has been shown [O. K. Mawardi and I. Dyer, J. Acoust. Soc. Am. 25, 389 (1953); D. M. A. Mercer and I. Dyer, Preprint 544, presented at the I. A. S. annual meeting, New York, 1954)] to correlate well with a dimensi
Autor:
Derwent M. A. Mercer
Publikováno v:
The Journal of the Acoustical Society of America. 27:203-203
The dependence of the total acoustic power radiated by a turbojet engine on one dimensionless parameter was put forward by Mawardi and Dyer. This relationship is reviewed in the light of further data, and also the dependence of acoustic power on a nu