US818892A - Telegraphy. - Google Patents

Description

PATENTED APR. 24, 1906.

S. F. JONES. TELBGRAPHY.

APPLICATION FILED NOV, 21, 1905.

om m %g: 6- 3 mboz O'NTTE STATES PATENT OFFICE.

S"ERNS F. JONES, OF NE YORK, N. Y., ASSIGNOR OF ONE-HALF TO POSTAL TELEGRAPH-CABLE COMPANY. OF NEW YORK, N. Y., A

CORPORATION OF NEW YORK.

TELEGRAPHY.

Specification of Letters Patent.

Patented April 24, 1906.

TO (IN 10/1/0722 it may concern:

Be it known that I, STERNS F. JONES, a citizen of the United States, residing in the borough of Brooklyn, in the city of New York, county of Kings, State of New York, have made certain new and useful Improvements in Telegraphy, of which the following is a specification.

This invention relates to that form of telegraphy in which short and rapid alternations of current are divided into groups of varying length and sequence according to a code under the control of a key or circuit-changer.

The object of my invention is to strengthen the transmitted impulses and to strengthen the received impulses without changing the electromotive force or strength of current of the altcrnatirig-current generator.

To this end there is provided a separate or local circuit at each station containing a polarized receiving-relay in series with a condenser, the contact-points of a suitable transmitter, and the coils of a transformer. In a branch of this circuit there is a constantlyoperating generator yielding short and rapid alternations of current. The coil of the transformer in the local circuit is in inductive relation to a second coil in the main line, and the coil of the transformer in the local circuit is divided into two unequal sections, the smaller section being included in circuit with the alternating generator when the trans- :mitter is closed, and both sections are included with the receiving-relay when the transmitter-contact is open. It results from this that the current of the generator is stepped up onto the line, and the impulses received in the line-coil are stepped up into the local circuit.

The accompanying drawing illustrates my invention.

at is a main telegraph-line connecting two separated stations. Included in series with the circuit at each station is a condenser f. The apparatus at one station is a duplicate of that at the other and is included in a compound local circuit.

1' is a polarized receiving-relay having a retracting-spring included in the conductor 5 6 in series with the condenser c and the coils 0 (Z of a transformer. The coil 0 preferably has thrlee times the number of turns given to the coi (Z.

9 is a generator yielding short and rapidlyrecurring alternations of current to the extent of two or thrce hundred per second. It is included in a conductor 2 4, the conductor 4 being connected to the junction between the coils c and (I. The conductor 2 is conncctcd to a fixed contact 7 of an electromagnetic transmitter. The conductor 3 is connected to the movable contact 8 of said transmitter. 0 is the vibrating lever of the electromagnetic transmitter. which is retracted by the spring a, operated by the electromagnet it under the control of the Morse key It, operating in the local circuit 10 ll with the local battery 1. The second coil of the transformer i is included in the main line and has twice the number of coils assigned to the coil (1. The transformer has both coils composed of wire of the same gage and resistance. If we assume the coil 1! to be unity, the coil i will be represented by 2, and the coil c will be represented by 3, and the sum of coils c and (I as compared with coil '1'. will be in the proportion of two to one.

The operation of the apparatus is as follows: Upon closing the key 7c the transmitter closes the contact 7 S and includes the generator 9 in a branch circuit with the coil d, including elements 9, 4, (Z, 3, 8, 7, and 2. The alternations during the closed period are stepped up onto the line in the proportion of one to two. W'hen the transmitter is open at the points 7 8 to provide for receiving signals on the relay 1*, the relay '1' is included in the local circuit with both G(.).llStCi-l01lS c and (Z in series. The circuit includes the elements 5, c, c, (Z, 3, 8, 0, 6, and 1'. The received impulses in the coil i are transformed into the local circuit in the ratio of one to two, there being twice the munbcr of convolutions in the two sections c and (7 as compared with the coil 1'. It results from this arrangement that impulses transmitted from the generator {1 are stepped up onto the line m, and impulses received from the circuit 771 are stepped up into the local circuit containing the relay 1'.

What I claim, and desire to secure by Letters Patent, is-

1. The combination with a telegraplbline at each of two or more stations, of a transformer-coil in the main line, a local circuit containing a receiving-relay in series with a condenser, a transformer-coil and the contact points of a suitable transmitter; an alternating-current generator in a branch of said circuit, one terminal of which branch is connected to said transformer-coil at a point intermediate its ends, the other terminal of said branch and the terminals of said local circuit being connected to said transmittercontacts in such a manner that when said transmitter is closed the alternating-current generator is included in circuit with one coil of said transformer, and when said transmitter is open the receiving-relay is included in circuit with both coils of said transformer.

2. The combination with a telegraph-line at each of two stations, of a transformer-coil in the main line, a local circuit including a receiving-relay, a transformer-coil and the contact-points of a suitable transmitter, an alternating-current generator in a branch of said circuit having one terminal connected to said transformer-coil at an intermediate point, the other terminal and the terminals of the local circuit being connected to transmittercontacts in such a manner that when the transmitter is closed the generator is included in circuit with one coil of said transformer and when open the receiving-relay is included in circuit with both coils of said transformer.

3. A telegraph-line having means for transmitting and receiving code-signals by varying the length and se uence of groups of alternating impulses wit a local circuit and a transformer at one station, said transformer having one coil in the main line and one coil in the local circuit, the last-named coil divided into two unequal sections, the smaller coil being in circuit with the transmitting generator.

4. The combination with a telegraph-line at each of two stations, of suitable alternating-current transmitting and receiving apparatus in a local circuit and a transformer having three coils, including a main-line coil, a transmitting-coil, and a receiving-coil, and means for including the two last-named coils in circuit in series with the receiving apparatus during the operation of receiving.

5. A telegraph-line having means for transmitting and receiving code-signals by varying the length and se uence of groups of alternating impulses, it a local circuit and a transformer at one station, said transformer having three coils, one coil in the main line, a transmitting-coil and a receiving-coil, and means whereby the transmitting-coil alone is included in circuit during the act of transmitting.

6. A telegraph-line having means for transmitting and receiving code-signals by varying the length and se uence of groups of alternating impulses, wit a local circuit and a transformer at one station, said transformer having three coils, one coil in the main line, a transmitting-coil, and a receiving-coil, and means whereby both receiving and transmitting coils are included in circuit in series with 1 the receiving apparatus during the operation of receiving.

HENRY G. FRrTscHE, A. M. DONLEVY.

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