Daboll trumpet

In the trial of the relative power of various instruments made by Gen. Duane in 1874, the twelve-inch whistle was reported as exceeding the first-class Daboll trumpet.

Beaseley reports that the trumpet has done good work at various British stations, making itself heard from five to ten miles.

Gen. Duane, reporting as to his experiments in 1881, says: "The Daboll trumpet, operated by a caloric engine, should only be employed in exceptional cases, such as at stations where no water can be procured, and where from the proximity of other signals it may be necessary to vary the nature of the sound."

Thus it would seem that the Daboll trumpet is an exceptionally fine instrument, producing a sound of great penetration and of sufficient power for ordinary practical use, but that to be kept going it requires skillful management and constant care.

"Congress made an appropriation in 1860 authorizing the Light-House Board to make experiments with "Daboll's trumpet and other ear signals," but nothing was done until some time later."