Chanaud, Robert (1970). "Aerodynamic whistles". Scientific American. 222 (223): 40–46. Bibcode: 1970SciAm.222a..40C. doi: 10.1038/scientificamerican0170-40. Acoustic length [76] or effective length [77] is the quarter wavelength generated by the whistle. It is calculated as one quarter the ratio of speed of sound to the whistle's frequency. Acoustic length may differ from the whistle's physical length, [78] also termed geometric length. [79] depending upon mouth configuration, etc. [30] The end correction is the difference between the acoustic length and the physical length above the mouth. The end correction is a function of diameter whereas the ratio of acoustic length to physical length is a function of scale. These calculations are useful in whistle design to obtain a desired sounding frequency. Working length in early usage meant whistle acoustic length, i.e., the effective length of the working whistle, [80] but recently has been used for physical length including the mouth. [81] Loudest and largest whistles [ edit ]

Siren Whistle - Etsy Siren Whistle - Etsy

a b "The History of Fog Signals by Wayne Wheeler | US Lighthouse Society". uslhs.org . Retrieved 2021-07-21.a b Pringle, R.E.; Parkes, J. (1839). "The causes and means of prevention of steam-boat accidents". Mechanics Magazine (31): 262. a b c BIRCH, A. D.; BROWN, D. R.; DODSON, M. G.; SWAFFIELD, F. (1984). "The Structure and Concentration Decay of High Pressure Jets of Natural Gas". Combustion Science and Technology. Informa UK Limited. 36 (5–6): 249–261. doi: 10.1080/00102208408923739. ISSN 0010-2202.

A Pocket Siren! : 7 Steps (with Pictures) - Instructables A Pocket Siren! : 7 Steps (with Pictures) - Instructables

A fire-warning whistle supplied to a Canadian saw mill by the Eaton, Cole, and Burnham Company in 1882 measured 20inches in diameter, four feet nine inches from bowl to ornament, and weighed 400 pounds. The spindle supporting the whistle bell measured 3.5inches diameter and the whistle was supplied by a four-inch feed pipe. [86] [87] Außerlechner, Hubert J.; Trommer, Thomas; Angster, Judit; Miklós, András (2009-08-01). "Experimental jet velocity and edge tone investigations on a foot model of an organ pipe". The Journal of the Acoustical Society of America. Acoustical Society of America (ASA). 126 (2): 878–886. Bibcode: 2009ASAJ..126..878A. doi: 10.1121/1.3158935. ISSN 0001-4966. PMID 19640052. Toroidal or Levavasseur whistle – a whistle with a torus-shaped (doughnut-shaped) resonant cavity paralleling the annular gas orifice, named after Robert Levavasseur, [23] its inventor. Unlike a conventional whistle, the diameter (and sound level) of a ring-shaped whistle can be increased without altering resonance chamber cross-sectional area (preserving frequency), allowing construction of a very large diameter high frequency whistle. The frequency of a conventional whistle declines as diameter is increased. Other ring-shaped whistles include the Hall-Teichmann whistle, [24] Graber whistle, [25] Ultrawhistle, [26] and Dynawhistle. [27] For example, Weisenberger, Richard (1986). Build an eight inch super whistle: an introduction to the toroidal whistle. Horn and Whistle 25:4-6. A whistle has a characteristic natural resonant frequency [30] that can be detected by gently blowing human breath across the whistle rim, much as one might blow over the mouth of a bottle. The active sounding frequency (when the whistle is blown on steam) may differ from the natural frequency as discussed below. These comments apply to whistles with a mouth area at least equal to the cross-sectional area of the whistle.

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Miller's Steam Boiler Alarm and Water Gage". lincolnarchives.us. 2007-09-08. Archived from the original on 2008-03-28.