US371980A - Charles selden - Google Patents

Description

(No Model.) 2 Sheets-Sheet 1.

G. SELDEN.

AUTOMATIC AND AUTOGRAPHIG TELEGRAPHY.

No. 371,980. Patented 0015.25, 1887.

(No Model.) 2 Sheets- Sheet 2. O. SELDEN.

AUTOMATIC AND AUTOGRAPHIO TELBGRAPHY. No. 371,980. Patented Oct. 25, 1887.

ERS. FIIolwLithognphor, wmimm D. C.

NlTE STATES PATENT rrrcao CHARLES SELDEN, OF LALTIMORE, MARYLAND, ASSIGNOR OF ONE-HALF TO \VILLIAM T. BARNARD, OF SAME PLACE.

AUTOMATIC AND AUTOGRAPHIC TELEGRAPHY.

SPECIFICATION forming part of Letters Patent No. 371,980, dated Gotober 25, 1887.

Application filed October 7, 1886. Serial No. 215,577. (No model.)

To all whom it may concern.-

Be it known that I, CHARLES SELDEN, a citizen of the United States, residing at Baltimore, in the State of Maryland, have invented certain new and useful Improvements in Automatic and Autographic Telegraphy, of which the following is a specification.

My invention relates to the telegraphic transmission of facsimiles automatically, and it has for its object to increase the speed of such transmission by the simultaneous employment of currents of varying strength and polarity, whereby a diplcxor quadruplex systern is obtained.

In illustrating the principle of my invention I show in the accompanying drawings, in Figure 1 a diagrammatic view of one application ofthe same to a single diplex line, and in Fig. 2 a similar view applied to two diplex lines.

Referring to Fig. 1, O is an ordinary automatic or autographic telegraph cylinder, covered, as usual, with a message in conducting and non-conducting spaces.

F F are contact fingers or brushes resting upon and traversing different portions of the cylinder 0, which contains either two contiguous portions of a single message or two independent messages. Each finger is in a sepa rate local circuit, A B, including the magnets D E, respectively. lhe magnet D controls a polarity-changing key, F, and'the magnet E controls a tensionchanging key, G, both included in the main-line circuit, having a sectional battery, H, and arranged to operate in the usual well-known manner to send currents of varying polarity and tension, respectively, to the line, as in the ordinary diplcX telegraph.

lf the cylinder 0 is rotated by any suitable means,and is covered,for instance, with a message written in conducting-ink upon a non conducting sheet, the finger F, whenever it comes in contact with aconducting portion of the messagesheet, will close the local circuit A, actuating the magnet D, which in turn will operate the pole-changing key F to send an electric impulse of given polarity to line L,

and if finger F comes in contact with a conducting portion of the message it will in like manner cause an impulse of given strength to be sent to line through the medium of key G.

At the receiving-station there is a recording-cylinder, 0, upon which bear two armature pens or pencils, P P, the one P being actuated by the magnet S, and the other, P being actuated by the magnet S These magnets are respectively in the local circuits T T.

Local circuit T is controlled by the polarized relay R, located in the main line, and the local circuit T is controlled by the neutral relay R. It will thus be seen that a current of given polarity upon the line controlled by finger F will operate the stylus or pen P, while a current of given strength controlled by finger F will operate pen or stylus P and thus the message or. messages inscribed upon cylinder 0 will be reproduced upon cylinder 0.

As above stated, there may be two independent messages upon cylinder C, and they will be both transmitted at the same time over one line-wire; or, if there are two contiguous parts of a single message upon cylinder 0, the same will be reproduced in one-halfthe time that is required for ordinary facsimile transmission as heretofore practiced.

Having described the operation of a diplex autographic telegraph,it will be plain to those skilled in the art that by the use of the ordinary devices--such as differential relays, rheostats, and condensers-the system may be extended to a quadruplcx autographic telegraph, and that facsimile transmission upon a single Wire may be had at the same time in opposite directions.

WVhile I have shown the local magnets conneeted up directly in the circuits, it is evident that I may use differential magnets, or that they may be placed in a shunt or a Whcatstone bridge in the manner Well understood.

Referring to Fig. 2, the cylinder 0 is shown as made in two sections insulated from each other and connected with each section in a system of transmission such as has been described with reference to Fig. 1, and each system has an independent main line, L L and the receiving-pens P 1 P are arranged to operate upon the single cylinder G. these pens being actuated by magnets S S S S in the local circuits. I have shown a single local battery, LB LB", energizing each pair of pens connected with the respective lines. I can thus transmit by means of one transmittingcylinder four individual messages at the same time in a single direction, and by duplexing this arrangement in the ordinary Way I can double the capacity of the system.

I have not indicated any special means of rotating the cylinders, as it will be understood that any usual and well-known means may be used, and the rotation of the cylinder may be effected or controlled by one of the local magnets.

It is evident that my invention may be applied to other systems of multiplex telegraphy than that specifically indicated without departing from the spirit thereof.

What I claim is 1. In an automatic autographic multiplex telegraph, the combination of a transmittingcylinder, a series of contact-fingers bearing thereon, a receiving-cylinder with a like series of recording-pens, a single line circuit between the series of fingers and pens, and circuit-connections, substantially as described, whereby each pen is controlled by a separate linger, as set forth.

2. In an automatic autographic multiplex telegraph, the combination of a transmittingcylinder having a series of contact fingers bearing thereon, each controlling a current, and a receiving-cylinder having a like series of recording-pens, each actuated by a sepa rate current, anda single-line circuit connecting the series of fingers and pens, substantially as described.

3. In an automatic autographic multiplex telegraph, the combination of a transmittingcylinder having a series of contact-fingers bearing thereon, local circuits controlled by said fingers, current-controlling devices in the main-line circuit, each actuated by its separate local circuit, and a receiving-cylinder having a series of recording-pens, each controlled by the current-controlling device in the main circuit, substantially as described.

4. In an automatic autographic multiplex telegraph, the combination of the transmit ting-cylinder, the fingers bearing thereon controlling local circuits, current-controlling device in the main line actuated by said local circuits, a series of relays at the receivingstation, each adapted to a particular current from the main line, and recording-pens bearing upon the receiving-cylinder, controlled by the relays, substantially as described.

5. An automatic fac-simile telegraph consisting of a sectional transmitting-cylinder, a series of contact-fingers for each section, a re ceiving-cylinder having like series of recording-pens, and lines and circuit-connection for each series, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

OHARLES SELDEN.

\Vitnesses:

THOS. KELL BRADFORD, L. A. BUROK.

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