Telephone Magazine: An Illustrated Monthly Magazine, Volumes 21-22

Front Cover
0 Reviews

What people are saying - Write a review

We haven't found any reviews in the usual places.


Other editions - View all

Common terms and phrases

Popular passages

Page 12 - ... between the purchase of raw material and the sale of the finished product will produce thirty or sixty-day paper.
Page 19 - ... the line, but will throw the drop at the central office. At the central office a combination alternating and direct pulsating current generator or pole changer, giving both kinds of current, is used, so that negative or positive current may be applied so that they will respond to opposite currents only one of the four bells will be rung at one time. See diagrams I and 2 for the connecting up of the instruments on the circuit and the different arrangements of the connections for the bell circuits....
Page 133 - ... granules, between the granules themselves, and between the granules and the back carbon electrode E, will produce a microphonic action.
Page 253 - A telephone engineer is one who practices the design and construction of telephone apparatus, telephone circuits and telephone operating methods and the correlation of all three into systems of telephone communication. "If the definition be granted, let us then claim a place for him among the engineers of more- classical reputation, giving him credit for his accomplishment and our best wishes for his future.
Page 141 - Where many wires are used the transposition must be carefully planned. When two circuits only are considered, transpositions in one of them only will serve to prevent...
Page 199 - In a metallic system this can onlf occur when the battery or live wires of two circuits are crossed together. 27th. Selective signal party line bell. A — Rings when not wanted. B — Rings weak or not at all. A— See No. 15. B— See No. 14B. , 28tb. Receiver weak. If local battery instruments are used in connection with this system, the receiver must be connected to the line in such a way that the current reinforces the magnetism of the receiver instead of weakening it. The polarity may be determined...
Page 97 - The idea of using carbon frails held loosely between a back block and a vibrating diaphragm has received considerable attention. Nearly all independent manufacturers have used some form of this type at some time. A form shown in Fig. 6 has been used to quite a large extent and is a good example of a transmitter belonging to the multiple-electrode class.
Page 182 - If every month each secretary will forward reports of meetings, changes in officers, new exchanges and other information which will be interesting to his fellow workers, the same will receive our prompt attention. Copy should reach this office not later than the 7th of the month. The Independent Telephone Association of the United States of America. President— James M. Thomas, New York, NY First Vice President— Hugh Dougherty, Bluffton, Ind.
Page 148 - It rings other bells strongly, but its own bells are weak or will not ring. The trouble, in this case, is weakness of the ringer magnet or poor adjustment of armature. The armature (or vibrating bar to which the hammer lever is attached) is polarized, or magnetized by a bent steel magnet. This armature should be so adjusted that it will be equally near to both poles of the electro-magnets, and loose enough in its trunionsto move freely. Unless interfered with, and thus thrown out of adjustment, the...
Page 9 - Fig. 25 have been found to correctly represent the changes in resistance due to varying pressure. 53. The opinion is now held by many leading telephonists that the action of the microphone is due almost entirely to changes in surface contact, and that while some of the actions set forth in the other theories may be present to some extent, they do not in any perceptible manner modify the general result. In the case of rough electrodes, the action might be considered to be brought about by changes...

Bibliographic information