By Warwick William Wroth
This Elibron Classics version is a facsimile reprint of a 1889 variation through Longmans & Co., London.
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Additional info for Catalogue of the Greek Coins in the British Museum
Ten minutes should be allocated to this exercise. 1 Frequency weightings Almost all sound level meters are equipped with an ‘A-weighting’ setting in addition to the un-weighted ‘lin’ or ‘linear’ setting. The A-weighting is the standard weighting for outdoor community noise measurements and is commonly used for noise measurements within architectural spaces and within vehicles. The A-weighting reduces the sensitivity of the measuring instrument to both low and very high frequency sounds. It approximately follows the inverted shape of the equal loudness contour passing through 40 dB at 1 kHz.
However, these various mechanisms may be classed into two groups, which for convenience will be labelled: 1. Direct sound generation mechanisms whereby sound is a direct by-product of a physical process such as combustion or mass transfer. 2. Indirect sound generation mechanisms where sound is a result of a force producing the vibration response of a structure which in turn radiates sound. 6. The physical mechanism could be any of the following: • • • • • net displacement of fluid mass or volume (loudspeaker, exhaust tailpipe); unsteady combustion (engine, furnace, boiler); unsteady fluid transport (flow noise); fluctuating force on a fluid (fans, wires in a flow); fluctuating shear force (shear layer noise in a jet).
1000 Hz tone, generated by Matlab™ and played on Microsoft™ MediaPlayer. 10 000 Hz tone, generated by Matlab™ and played on Microsoft™ MediaPlayer. 9; f0=100; % frequency (Hz): change from 100 to 1000 to 10,000 a=a1*sin((2*pi*f0*t)); wavwrite(a’,fs,‘c:\hz100’) In order to explore sound further, attention should now be given to the subject of pitch. Lord Rayleigh gives a well-known discussion of pitch (Rayleigh, 1894). The highlights are: When passing from any note to its octave, the frequency of vibration is doubled At the Stuttgard Conference in 1834, c′ = 264 complete vibrations per second was recommended [c′ is one octave above the lower c of the tenor voice].
Catalogue of the Greek Coins in the British Museum by Warwick William Wroth