US1671262A

US1671262A - Submarine sound reception

Info

Publication number: US1671262A
Application number: US20227A
Authority: US
Inventors: Williams Robert Longfelow
Original assignee: Submarine Signal Co
Current assignee: Submarine Signal Co
Priority date: 1925-04-02
Filing date: 1925-04-02
Publication date: 1928-05-29
Anticipated expiration: 1945-05-29
Also published as: GB250160A

Description

May 29, 1928. I 1,671,262

. f R. L. WILLIAMS SUBMARINE SUND RECEPTION Filed April 2, 1925 52 Amplifier Filter j jnnnunmnl 33 28 \27 42 2 4 24.

23 32 A 40 y /BEH L J 4 2 3o 31 20 5 I j 2 25 A \7 9 K 8 l I6 1o J5 l I8 INI/lizvTo/e.

A TT ORNE Y.

Patented May 29, 1928.

UNITED TES imm

ori-fea."

i Y. ROBERTA LONGFEIiLOW WILLIAMS, OF NEWTON, MASSACHUSETTS, ASSIGNORTO SUB- MARINE SIGNAL CORPORATION, OF BOSTON, MASSACHUSETTS, CORPORATION OF DELAWARE.

SBMARINE soUNn RECEPTION.

Application med' April 2, i925. serial No. 20,227.

TheI present invention relates to an. improvement in submarine sound reception and comprises "mainly a skin mounted aperiodic receiver in' a special valve within a ship and conveying the signals. received to a listener through a circuit designed for selective reception'.

One of the objects of the present invention is to present a suitable removable mounting and removable aperiodic receiver which can be chanced without the necessit of the ship going` into dry dock.

Another feature of the present invention is to surround the actuated diaphragm of the receiver by such an inertia mass that the vibrations of the ship will have little effect upon exciting the diaphragm or the microphone connected therewith. n

A'further feature of the present invention is the combination of an aperiodic receiver with a filter and amplifying circuit which presents distinct advantages in the selective reception of submarine sound waves.

Other features of the present invention will be learned from the description in the specification and the drawing in. which the figure shows a part sectional view o f thereceiver and the circuit used for reception.

The receiver is, of course, installed under the water line of the vessel where the diaphragm will be continually adjacent to the water.

In the figure, 1 indicates the valve pro er which consists of a hollow cylinder 2, wit a gate opening 3, behind which the plunger 4 is adapted to move into a seat 5 to close the rear of the cylinder from the outer Water. This is accomplished b turning the hand wheel 6. Both ends o the gate valve are provided with anges 7 and 8.

The front flange 7 is bolted to a composition seat 10 b means of machine screws 9, 9, which lass t rough the latter and thread into a eavy inertia ring 11 rigidly riveted to the ships plate 12. Between the ships plate and inertia ring is a suitable gasket 13, and likewise the composition scat 10 and the flange 7 are providedwith

suitable gaskets

14 and 15, the former between pieces ldaiig 11, and the latter between pieces 7 an The rear end of the cylinder 2 closedin the following manner. A cap 16 is firmly clamped to the flange `

8by bolts

17, 17. Be- 55 tween 8 and. 16 is a'suitable gasket 18.A A

stuffing vboi; 19 of'usual construction closesv the opening in the cap 16, through which the stem 20 passes.

' At one end of the stein 20 is the receiving apparatus21 which will be described shortly. At the opposite end of the stem 20'is a cap 22, foi-min part of a clamping means to hold the cab e 23 in position so that no strain will be placed upon the wires withinV the stem 20.- 'lhe cap 22 is threaded at 24 to against a shoulder 26 of the cap 22. Near the edge of the piece 25 are

studs

27, 27 and

nuts

28, 28 threading thereon, the studs 27 serving to hold the piece 25 firmly against the shoulder 26 of the stein 20.' In this way the receiver 43 is held firmly in place.

The receiver 21 consists of a rubber shell 30`having an opening in the back and a recess 31. The frontY is formed of a diaphragm 32 with a beveled edge 33 which through the pressure exerted by the piece 25 upon the stein 20 rests firmly in the bevel o The operation of the apparatus is obvious and therefore needs little explanation. The incoming signal vibrating the diaphragm causes a change of resistance in the micro-1 phone 1n the usual manner which is trans' telephone. i

In particular the 4 rubber diaphragm is practically aperiodic so that it iis-equally sensitive to all frequencies. As the result of this the low frequency water noises actuate the diaphragm at their own frequency. This mitted to the filter and finally heard in the receive the piece 25 which normally bears'- V'(0 threading into the piece 16 and the nuts `28V icov j at all. The aim of the present system is to preserve the characteristic frequencies of the mcomin disturbances and filter the bands in which tese frequencies occur so that only the incoming signal is transmitted to the amplifying circuit. In this manner all opportunity of the incoming disturbing noises operating the amplifier by impact excitation is also avoided. The present system while sensitive to very weak noises and signals is ractically freev from disturbances of the ormer, after the signals have been filtered and amplified.

In addition to this feature the ships noises are practically entirely excluded by the loose be coupling effected between the microphone and the ships plate. This is effected by means of the large inertia plate 11, which is rigidly riveted to the skin of the vessel, by the composition seat lO-and by the rubber shell 30, which only sets snugly but not rigidly in the composition seat. The mass of the diaphragm which is exceedingly small bein made of the rubber which is of low specific gravity is only loosely connected with a ve large inertia mass of iron of high specl c gravity, the combination o f which -may be shown both mathematically and experimentally to be of the very loosest couling. The result is, therefore, that very ittle of the ships vibrations is transmitted to the diaphragm and these therefore are entirely excluded from the system. This is especially advantageous since the vibrations, due to the ships noises, may be of almost any frequency, depending upon the kinds of apparatus used upon the ship. In addition the composition seat serves another function. As it will not corrode and is only'bolted to the inertia plate, it can easily be removed when the ship is in dry dock. This is an advantage over former systems used.

In describing the microphone receiver 43 above, it should have been remarked that the present installation is adapted to be installed in the bottom of the vesseL/ In this position the button itself, that is the plane of theelectrodes, will be vertical so that the granular carbon which lies loose between the electrodes can come in contact with both electrodes and make a good electrical circuit. The installation is such that whatever vLarnaca position the diaphragm 32 is in, themicrophone is in a vertical position. This is accomplished by bending the stem 42 in such a manner, thatthe button is always vertical.

and a peripheral seat, amicrophone, meansmounting said microphone on said diaphragm wall and means mountin said shell 1n said opening in the skin wit the outer dia hragm wall. flush with the outer skin surace, including a. large inertia member about said opening and a portion having a seat cooperating with said shell seat.

2. In combination a vessel having an opening in its skin, a soft rubber shell having a diaphragm wall with a plane outer portion and a peripheral seat, a microphone means mounting said microphone on sai diaphragm wall and means mounting said shell 'in said opening in the skin with the outer diaphragm wall flush with the outer skin surface, including a large inertia memr permanently secured to the skin surrounding said opening and a seat member bolted to said inertia member in which said shell rests.

3. In combination a vessel having an opening in its skin, a soft rubber shell having a diaphragm wall with a plane outer port-ion and a peripheral seat, a mlcrophone,l means mounting said microphone on said diaphragmy wall and means mounting said shell in said openin in the skin with the outer diaphragm wal flush with the'outer skin surface including an inertia member in which said shell sets secured to the skin and means for maintaining said shell firmly in said inertia member.

4.-. In combination a vessel having an opening in its skin, a soft rubber 4shell havinga diaphragm wall with a plane outer'. portion and a peripheral seat, a microphone, means mounting said microphone on said diaphragm wall and means mounting said shell 1n said openin in the skin with the outer diaphragm wal flush with the outer skin surface including an inertia member surrounding said opening and a removable seat member bolted to said inertia member in,

which said shell rests.

5. In combination a vessel having an opening in its skin, a soft rubber shell having a diaphragm exposed to the outer water ad- 'jacent to said opening, a microphone, means mounting said microphone on said diaphragm and means mount-ing said shell in said opening in the skin with the outer diaphragm wall flush with the outer skin surface, including a large inertia member about said opening and a portion having a seat cooperating with said shell seat.

lll

ivnaea skin with the outer diaphragm wall Hush i with the outer skin surface, including a large inertia member about said opening and a 1u portion having a seat cooperating with said shell seat.

n testimony whereof I aix my signature.

ROBERT LONGFELLOW WILLIAMS.