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dials disc encyclopedia explains holes how illustration loud mee number passing picture produce puffs rapid record revolves siren sound succession tube turns vintage waves which worksVintage Illustration Of How The Siren Works Editorial Photo
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Vintage illustration of how the siren works #215028071
Description
The Children`s Encyclopedia by Arthur Mee 1940s.This picture explains how the siren works. As the disc revolves, the holes are brought in rapid succession over the tube A, and the puffs of air passing through these holes produce a loud sound. The dials record the turns of the disc from which the number of puffs and sound waves can be calculated.
This image is editorial
