US913734A - Telephony. - Google Patents

Description

I. KI-TSEE.

TELEPHONY. APPLICATION. nmm NOV. 22, 1905.

Patented Mar. 2, 1909.

UNITED STATES PATENT OFFICE.

ISIDQR KITSEE, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR OF ONE-HALF TO WILLIAM J. LATTA, OF PHILADELPHIA, PENNSYLVANIA.

TELEPHONY.

Specification of Letters Patent.

Patented March 2, 1909.

Application filed. November 22, 1905. Serial No. 288,549.

To all whom it may concern:

Be it known that I, Isinon Kirsnn, a citizen of the United States, residing at Phila delphia, in the State of Pennsylvania, have invented certain new and useful Improvements in Telephony, of which the following is a specification.

My invention relates to an improvement in telephony, and has particular reference to the telephone circuit extending between stations.

It is the object of my invention to provide sources of inductance atintervals along the line circuit and to improve the action of each inductance over the action of an inductance having a normally unmagnetized core.

For an illustration of my invention, reference may be had to the accompanying drawing, where A and A represent two telephone stations joined by the line wire or conductor L. Each terminal station comprises an induction coil (Z, whose secondary (Z is connected in the line circuit along with the usual receiver R. The induction coil primary (Z' is connected with the usual microphonic or other transmitter a and the source of energy 5.

At intervals in the line conductor L are serially connected inductance coils F having cores F. These cores F may be permanent magnets, but by preference they are not in themselves permanently magnetized, but are permanently magnetized by the external permanent magnets I? I have found that from the use of inductances at intervals in a telephone circuit when the inductance cores are thus permanently magnetized, there results an improvement in the transmission of speech. I am aware that induct ance coils have been inserted at intervals in the telephonic line, but the cores of such inductances have invariably been, I believe, not normally magnetized. I am aware that for the purposes of resonance in short circuits where lumped capacity is employed, it has been proposed to normally magnetize an inductance core. But my invention resides in a long telephone circuit in which inductances are inserted at intervals, the cores of such inductances being normally magnetized, no resonanceeffects occurring in such a case, inasmuch as the voice currents are always changing in frequency, the frequencies extending over a very wide range.

lVhat I claim is:

1. In a telephone system, a line circuit connecting a plurality of stations, telephone transmitting and receiving apparatus associated with said line circuit at said stations, a plurality of loading inductances inserted at intervals in said line circuit between stations, and cores for said inductances normally magnetized independently of the current transmitted over said line circuit.

2. In a telephone system, a line circuit connecting a plurality of stations, telephone transmitting and receiving apparatus associated with said line circuit at said stations, a plurality of inductance coils inserted in said line circuit between stations at practically regularly recurring intervals, and cores for said inductance coils normally magnetkzed independently of the telephonic currents transmitted over said line circuit.

3. In a telephone system, a line circuit connecting a plurality of stations, telephone transmitting and receiving apparatus associated with said line circuit at said stations, a plurality of loading inductances connected in series in said line circuit between stations and at suitable intervals, and cores for said inductances normally magnetized by permanent magnetism and independently of cur rent transmitted over said line circuit.

4. In a telephone system, a line circuit connecting a plurality of stations, telephone transmitting and receiving apparatus associated with said line circuit at said stations, a plurality of loading inductances included in said line circuit atintervals between sta- ISIDOR KITSEE.

Witnesses ALvAH Rrr'rnNHoUsE, MARTHA BONNER.

Images