US241385A - look-wood - Google Patents

Description

(No Model.) #Shegts-Sheet 1. R. M. LOOKWOOD & H. BARTLETT.

Transmitter for Telephones.

No. 241,385. Patented May 10,188I...

N. PETERS. Fhoto-Liihugnphe Washington, D. C.

(No Model.) 2 Sheets-Sheet 2.

R. M. LOOKWOOD 8: S. H. BARTLETT;

Transmitter for Telephones.

No.'241,385. Patented Maj 10,1881

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I N. PETERS, Fhnimulhognphan Washington, D. C

UNITED STATES PATENT OFFICE.

ROBERT M. LOCKWOOD AND SAMUEL H. BARTLETT, OF NEW YORK, N. Y., ASSIGNORS, BY MESNE ASSIGNMENTS, TO MOLECULAR TELEPHONE GOM PANY, or SAME PLACE.

TRANSMITTER FOR TELEPHONE S.

SPECIFICATION forming part of Letters Patent-No. 241,385, dated May 10, 1881.

Application filed July'2, 1880. (N model.)

To all whom it may concern Be it known that we, ROBERT M .LOCKWOOD and SAMUEL H. BARTLETT, of the city, county, and State of New York, have invented certain new and useful Improvements in Transmitters for Telephones, of which the ibllowing is a full, clear, and exact description, reference being had to the accompanying drawings, making part of this specification, in which-- Figure 1 represents our improved transmitter in section. Fig. 2 represents a side elevation of a vase or stand for supporting the trans mitter, shown applied thereto in dotted lines. Figs. 3 and 4 are plan views of the two carbon buttons or plates. Figs. 5 and 6 represent modifications-in the construction of the transmitter; and Figs. 7,8, 9, 10, and 11 are detail views illustrating the same.

A The invention relates to a novel construction of embedded microphone; and it consists in making the microphone of two plates or disks of carbon or other conducting material arranged one upon or over the other, one having a central perforation, and the other a cen- 2 5 tral pin or spur passing through said opening, through which connection is made with the binding-posts or line-wire; in embedding said plates in a block of cork or other non-resonant material, and in a novel manner of supporting 0 said embedded microphone in a stand or support, whereby only the upper surface of the block in which the microphone is'embedded, and by which it is covered, is exposed to the direct action of the atmospheric sound-waves,

3 5 all as hereinafter described.

In the accompanying drawings, A B repre sent the buttons or plates of carbon or other conducting material, the lower one, A, being made in the form of a fiat ring or of a disk 0 having a central perforation, a, as shown in J chamber, 1), formed in it for their reception,

the buttons fitting snugly within the chamber, and being providedwith a covering, D of cork or other material similar to that of which the non-resonant block D is composed. Wires 0 e are connected with the buttons, the one, 0, with the button A directly, and the other, c, with the pendent spur or pin 1), as shown,and extend thence through perforations in the cork and supportingstand, either or both, to the binding-postsff, as shown;

The elements or features above described constitute the transmitter per 86, but for convenience in handling, use, 850., we support the block D in a base plate or stand, which may bemade ornamental in design or configuration, as shown at G, Fig.2, only the upper face of the non-resonant block being exposed to the direct action of the sound-waves; This vase or stand is made preferably of lead or other non-resonant metal; but it may be of wood, '70

rubber, or other material, to give itthe desired weight,and wheretused in a factory or other building subject to the jar of machinery, should be cushioned on a pad or mat of wool, soft rubber, felt, or other suitable material, to -7 relieve it, as far as practicable, from disturlr ance from the jarring of the building.

In Fig. 6 the block or cork is shown fitted in a socket or cup formed in a metallic baseplate, H, and the pendent spur b on the upper carbon plate or button,instead of being connected by wire with the binding-post, dips into mercur Y in a cup, I, arranged within asocket in the base-plate H, and made adjustable up and down in said socket by means of a thumbscrew, J, for varying the depth or extent of immersion of the spur or point I) in the mercury. In this case the base-plate H is made a conductor, and connects the upper button, through the cup of mercury, with the bindingpost f, and the wire e and binding-post f pass through or are supported in insulators c 0 of rubber or other suitable material, as shown. The base-plate, in turn, is supported in a suitable stand or vase, G, as in the construction shown in Figs. 1 and 2. In Fig. 5 the lower button is'not perforated and the position of the upper button is re versed, the spur projectiu g upward, as shown. In this construction the central pin or spur, I), has the inner end of a delicate coiled spring, is, (see Fi 8,) connected with it the outer end of said spring being connected by wire with the binding-postf. By this arrangement of the spring or wire we get the benefit of the elasticity of a long piece of wire within a small space or compass and avoid any binding or trammeling of the upper button. The form of the button in this construction is represented in Figs. 10 and 11.

By the construction and arrangement of parts shown we dispense with one of the pieces of carbon constituting the embedded microphoneshown in our former patent, thereby simplil'ying its construction, and we so inclose the non-resonant material in which the microphone is embedded in itssupportin g vase or stand as- What we claim as new is- 1. In atelephone-transmitter, the two plates or disks of carbon, one of which has a central opening and the other a spur passing through said opening,through which connection is made with the line-circuit.

2. In a telephone-transmitter, the two disks or plates of carbon or equivalent conducting material, one having the central opening and the other the spur, through whiclreonnection is made with the line-wire, in combination with the block of non-resonant materialincasin g and covering said disks or plates, as described.

3. In a telephone-transmitter, the two disks or plates of carbon or their equivalent, constructed as described, and embedded within and covered by the non-resonant block, in combination with the supporting stand or base ineasing said block and leaving only its upper face exposed to the direct action of the atmospheric sound-waves, substantially asdescribed.

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