USRE1490E - Improvement in alarm-whistles - Google Patents

Description

UN. 0. LAMB.

\ Alarm Whistle. No. 1,490. I Riss'ued Jung2, 18 63.

N v PETERS, Pnam-Lnm nwv, Washinglum D. c.

UNITED STATES PATENT OFFICE.

NOYES D. LAMB AND ANSEL CLARK, NORWICH, CONNECTICUT, ASSIGNEES OF NOYES D. LAMB.

IMPROVEMENT lN ALARM-WHISTLES.

Specification forming part of Letters Patent No. 33,437, dated October 8, 1861 Reissue No. 1,490, dated J une 2, 1863.

To all whom it may concern:

Be it known that NOYES D. LAMB, of Norwich, in the county of New London and State of Connecticut, did invent a new and useful Improvement in AinWhistles, for which he received Letters Patent, dated October the 8th, 1561, said Letters Patent being now thejoint property of Novas D. LAMB and AN SEL CLARK; and we do hereby declare that the following is a full and exact description of the same, reference being had'to the accompanying drawings, making a part of this specification, and to the letters of reference marked thereon, in which- I Figure 1 represents in perspective the airwhistle. Fig. 2 represents a longitudinal vertical section through the same, to show its interior construction.

The improved air-whistle maybe made of tin, brass, or any other metallic substance, and is designed for use by sailing-vessels in cases where darkness, snow-storms, or heavy fogs may make it necessary to have means ready at hand for giving alarm-signals as a precaution against collisions. hen a greater volume of sound is required than could be produced by the mouth of the user, the whistle may be used in connection with an airpump,'which willgive the advantage of regular signals at short intervals by simply turning.

a cock.

The nature of the invention consists in the hereinafter-described combination of devices, for the purpose of producing sounds for signals or alarms by forcing air through the whistle with the mouth or with an air-pump, and is designed for use by sailing-vessels.

To enable others skilled in the art to make and use the invention, we will proceed to describe its construction and operation.

In the drawings, A is a tubular mouthpiece, through which the air is forced into the hollow cylinder B, to which the mouth-piece is attached. I

B is a hollow cylinder or receiver, and is fastened on the inside to the sounding-plate .C by three bolts, b. I

Steam-whistles, which the air-whistle resembles in appearance, are made with a hollow perforated tube for admitting steam to the whistle. Such a whistlecannot be blown loudly by the mouth or by air, and only by the use of steam for which itis specially adapted.

The receiver B of the air-whistle, by being constructed without the hollow perf. rated tube, (which is indispensable in steam-whistles,) is adapted to the capacity of thelungs, thereby producing a volume of sound which could only be madein the steam-whistle by the more powerful agency of steam. By letting the air into the receiver of the air-whistle, without the hollow perforated tube used in steam-whistles, a new effect is producedto wit: an increased volume of sound, sufficient for marine signals. A similar effect, with the same agency, cannot be produced on a steam-whistle. C is the sounding-plate, supported at the center by the standard E. The soundingplaie is fitted into the bottom of the receiver in such a way as to form a continuous aperture, D, between the circumference of the plate and the rim of the receiver, through. which aperture the thin stratum of forced air passes into the, bell or sounJing-cup F from the receiver or cylinder B.

E is the standard secured at one end, a, to the bottom of the sounding-cup, and at the other end, 0, to the sounding-plate C, for the purpose of connecting them together. The sounding-cup or bell F is so placed as to admit the air from the receiver and allow the same to escape, aidng thereby in the production of sound. The sounding-cup F may be so secured to the standard as to slide on the same, for thepurpose of varying the sound, increasing or diminishing the size of the outlet G having that effect.

11 is a handle by which the whistle may be held when blown by the month.

What is claimed in the construction of air alarm-whistles as the invention of NoYEs D. LAMB is The combination of the mouth-piece, receiving-cylinder, and sounding-cup or bell, constructed and operating together substantially as herein described.

NOYES D. LAMB, ANSEL CLARK. Witnesses:

HIRAM B. CROSBY, DAVID YOUNG.

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