"The best devices were a number of motor horns, which were obtained locally, but the supply was insufficient and there was no general issue. In a section on early attempts to put a gas alarm system in place he says. Given the identification of the Strombus Company with Train Horns, which were in turn derrived from motor horns in the early years of the 20th century, this comment form Auld's account Gas and Flame in Modern Warfare, published in 1918 is interesting.
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Once the valve has been opened the Sentry's hands are then free to get their own Respirator on- no rattles to rattle, or gongs to bash. The advantage of that of course is the system is use and forget. You saw what you reckoned was a gas cloud so you turned it on and it screamed for a minute- or until the gas was exhausted. In terms of procedure you can see why it was attractive as a solution. Archaeologically the valve would presumably look like the valves present on any gas cylinder of the period. The valve must hae been on the cylinder because of the danger of confusing the two if the spare was not turned upside down in the box. įrom the description of the operating procedure Rod gives it sounds as if you used a simple valve mechanism attached to the gas cylinder to get the horn to function. Now called Buell Air Horns if you go to their web site you can actually hear what we are talking about Ĭurrent models operate at between 50 and 150 psi gas pressure giving you around 120 dB. That fount of knowledge Wikipaedia states the American Strombus Co of Philidelphia was founded in 1912. Looking at photographs, and current models, if the horn element is found it will have a mechanism of copper and brass with an inlet for the gas supply and possibly a brass or steel bell. You get the dB you need from the power of the compressed gas so you do not need a large piece of kit great lengths of coiled brass pipe or large resonating chambers. The straight design is of course very easy to mass manufacture. A one note, air powered musical instrument. Essentially it s a resonating chamber with an amplifying bell. The Strombus Horn has a bulge at the back end which contains the diaphragm and a long horn on a straight axis expanding to a bell. which shows an 18' Strombus Air Horn from the Indiana Railroad I thnk we are seeing something very close to what we are talking about. If you look at the image from the AWM and at early industrial air horns such as this. The sound of a conch is, as Centurion says, deep, resonant and carries. My own twopennyworth- I think the term Strombus is less to do with the shape, but more to do with the sound.
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