Telephone Transmitter Page: 3 of 4
[1], 3 p. : ill. ; 23 cm.View a full description of this patent.
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one side. The slots of the connecting mem- into the stem 24. The electrode 22 is free to 65
bers 18 are caused to engage the fulcrum- vibrate, and between the two electrodes in
screws 14, and said connecting members are the chamber of the cup 23 a granular carbon
interposed between the heads 12 of the bolts 31 is disposed, the said cup being lined with
5 10 and the inner surface of the wall 1, as suitable paper. The electrode 22 and mica
shown by Fig. 1. When the bolts 10 are ar- disk carrying the same are made readily re- 70
ranged as shown by Fig. 1, the heads 12 there- movable from the cup, and the electrode 30 is
of press against the springs 17 and force the replaceable by other electrodes differing in
diaphragm 16 closely and firmly into engag- depth for the purpose of regulating the quan-
1i ing relation to the ring 15. If it is desired tity of carbon granules between the two elec-
at any time to remove the diaphragm, an op- trodes to accommodate a current of higher or 75
erator understanding the arrangement of the lower potential. The carbon disk forming
parts will remove the bolts 10 inwardly to the electrode 22 is of simple contour, so that
cause the cam-heads 12 thereof to become dis- it may be easily replaced when necessary un-
15 engaged from the springs 17 and relieve the der adverse conditions without delay incident
diaphragm of securing pressure, and the said to forming or procuring a particular-shaped 80
diaphragm may be removed by disengaging electrode. In the tubular supporting-arm 9 a
the connecting members 18 of the springs disk 31, of insulating material, is permanently
from the fulcrum-screws 14. If the parts of fastened by any suitable means, and project-
20 the case are separated by one not understand- ing from the center thereof is a contact-spring
ing the construction and mode of separating 32 of U-shaped form, which embraces and 85
and assembling the springs or the cam func- bears against the cap-nut 25, said spring be-
tion of the bolts, injury to or irregular ad- ing held in connection with the disk by a
justment of the diaphragm will be prevented. screw or analogous fastening 33, to which is
25 The heads of the fulcrum-screws 14 are lo- also fastened the usual flexible insulated con-
cated on the interior of the case, and this dis- ductor 34. Fig. 3 shows a modification of 90
position prevents said screws from being mo- the structure just explained and consists in
lested by an attempt to open the case from disposing the disk 31 against a shoulder 35,
the exterior, the nuts 11 being the only exte- formed in the tubular arm 9 and held in place
30 riorly-accessible fastenings. by the rear end of the cylindrical extension 8
The diaphragm 16 is formed from any de- of the cavity 7, the disk 31 in this arrange- 95
sirable material applicable for the purpose, ment carrying the same parts as heretofore
and projecting rearwardly from the center described. The cylindrical extension 8 in the
thereof is a boss or lug 17", having a finely- modified construction shown by Fig. 3 is cir-
35 screw-threaded opening l8"in the center there- cumferentially grooved, as at 36, and is held
of to receive a small thumb adjusting-screw in place by set-screws 37 engaging said groove, 100
19", provided with a lock or jam nut 20. This three of these screws being used, but only one
adjusting-screw 19" is disposed in operative shown in the drawings. It will be understood
relation to a cap 21, governing a front elec- that the adjusting-screw 19" is brought into
40 trode 22 to bring the latter under the influ- contact with the cap 21, and as this screw is ex-
ence of the vibrations of the diaphragm. The teriorly accessible after the mouthpiece 4 is re- 105
electrode 22 is supported in a cup 23, secured moved adjustment thereof may be readily
in the cavity 7, the cup being formed with a effected to vary the pressure of the end of the
central rearwardly - projecting stem 24, ex- screw on the cap to affect the diaphragm, as
45 tending through a central opening in the rear will be readily understood. This working
wall of the cavity and engaged by a cap-nut electrode 22 is governed by the vibratile ac- 110
25. Between the stem 24 and the wall of the tion of the diaphragm upon the cap or disk
opening in the rear side of the cavity 7 is an 21, and the diameter of said cap or disk is
angularly- shaped insulating - sleeve 26, the slightly less than the electrode 22 to cause the
50 front end of the cap-nut 25 closely impinging mica disk 27 to have more flexibility. Be-
against the said sleeve and forcing it to its tween this mica disk 27 and the electrode 22 75
place. The electrode 22 is formed from car- a circular piece of silk of the same diameter
bon and the cap 21 of metal, and between the as the electrode is interposed, as at 38, the
cap and the electrode is a mica disk 27, which outer edgeof saidsilk being preferably fringed
55 is held firmly on the cup 23 by a ring 28. The to prevent the granules of carbon entering
diameter of the electrode 22 is considerably between the same and the mica disk or washer. 120
less than the inner diameter of the cup, and I Mica will adapt itself better to the surface of
the metal cap 21 is held in connected relation the silk than it would to the carbon of which
thereto by a center screw 29, having its head the electrode 22 is composed, and, further-
6o countersunk in the rear side of the electrode. more, the use of mica in constructing the disk
Against the back of the cup 23 is a stationary or washer 27 is preferable, as it is more suscep- 125
electrode 30, which is held in place by a screw tible to the vibratile action of the diaphragm
31', having its head countersunk in the front and the delicate adjustment. The mica disk
face of said electrode and its shank ejected or washer, however, will be thicker than that791,892
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Reference the current page of this Patent.
Fletcher, Milton J. Telephone Transmitter, patent, June 6, 1905; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth509784/m1/3/: accessed July 2, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.