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He usually travelled through Grafton twice a month, and made it his convenience to put up over night with his friends. It was there I used to meet him. His name was Daboll, and he claimed to be descended from that ancient Connecticut maker of arithmetics and almanacs, Nathan Daboll. He said that was why he became a pedler he was born to calculate. Yet his occupation sat very lightly upon him.
So Reuben Daboll was no phenomenon; but his philosophy was phenomenal, at least to me, and kept me awake on the nights when the evening had been spent with him. It kept me awake, I say, for I never could reason far, and trying to think gave me a headache.
It was his idea that the sharpness or shrillness of the whistle constituted its chief value. And it is conceded that Mr. C.L. Daboll, under the direction of Prof. Henry, and at the instance of the United States Lighthouse Board, first practically used it as a fog-signal by erecting one for use at Beaver Tail Point, in Narragansett Bay.
Old leathern-bound Daboll, too, was brought to light, and its most difficult problems selected and sent to Mary, who, being an excellent mathematician, worked them all out to the widow's astonishment. But when it was known that quill pens had been discarded, and steel ones substituted in their place, Mrs.
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. The Siren.
The siren of the first class consists of a huge trumpet, somewhat of the size and shape used by Daboll, with a wide mouth and a narrow throat, and is sounded by driving compressed air or steam through a disk placed in its throat. In this disk are twelve radial slits; back of the fixed disk is a revolving plate, containing as many similar openings.
The Daboll trumpet was invented by Mr. C.L. Daboll, of Connecticut, who was experimenting to meet the announced wants of the United States Lighthouse Board. The largest consists of a huge trumpet seventeen feet long, with a throat three and one-half inches in diameter, and a flaring mouth thirty-eight inches across.
From the average of the tests it appears that the power of the first-class siren, the twelve-inch whistle, and first-class Daboll trumpet are thus expressed: siren nine, whistle seven, trumpet four; and their relative expenditure of fuel thus: siren nine, whistle three, trumpet one.
In all his experiments against and at right angles and at other angles to the wind, the trumpet stood first and the whistle came next in power. 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.
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