Louder than Joshua's?

"Ever since Joshua blew down the walls of Jericho, men have been making horns the wrong way," said Professor Frederick K. Kirsten of the University of Washington. Without actually saying that his horn was better than Joshua's, he announced that he had invented a horn to outshout all horns. Called a parabolic reflector type of air-raid siren, Professor Kirsten's horn has a ten-foot wooden cup which focuses the siren's shriek into a single noise beam, instead of throwing it to the four winds, and the reflector rotates the beam, like the beam of a lighthouse. With a small two-h.p. siren, Kirsten's reflector will outblast and outdistance any of Seattle's factory-made sirens. Kirsten believes that a 12-h.p. siren, parabolically beamed, would be heard 30 miles away; and three of them would startle Seattle as effectively as the 32 ordinary sirens which the city has ordered from Eastern manufacturers.

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