Knight's new mechanical dictionary. A description of tools, instruments, machines, processes, and engineering by Knight Edward Henry 1824-1883

Author:Knight, Edward Henry, 1824-1883. [from old catalog]
Language: eng
Format: epub
Tags: Industrial arts, Technology, Machinery. [from old catalog], Inventions
Publisher: Boston, New York, Houghton, Mifflin and company
Published: 1884-03-25T05:00:00+00:00

"American MiUer;' It. 80.

currents. The invention consists, in the combination with the telephonic circuit, of an induction coil, connected with the contiguous circuits in such a manner that a reactionary hiduction is established in the telephonic line of a power corresponding and similar to the primary inductife sction. but opposed to the same, so as to neutralise the action of the same.^' - .^ , :

Fig. 1444 is " a diagram representing one of the forms id which the compensation is effected. The large coils, e ^, are included in the telephonic circuit at each end of the line. In the coils are iron cores, surrounded by a primary coil, the ends of which may or may not be connected together, according to the compensation desired.

•• The iron core extends outside of the coils some distance. The circuits, No. 1 and No. 2, running in close proximity to the telephone wires, induce a momentary current to it eTerr time the circuits are opened or closed, the strength of which is proportionate to the proximity of the wires to each other and the number of miles that they run side by side. Them induced currents are in one direction in closing the circuit, and the opposite direction on opening the circuit. To neutralise the induced current from, say. No. 1 circuit, electro-magnet*, e e', are placed at each terminal in the clreuit ol

•♦ These magnets are then Ml^usted to approach the iron cores, k k*, until the induced current thrown into the coil«, e and c', and telephone line by the action of the magnets, t and e', is equal, but opposite to, the induced current from the circuit No.l thrown into the telephonic wire by running parallel to it. Thus a perfect compensation is attained.

" If the two lines run parallel for long distances the two ends of the primary coil on c and c' are connected together, and thus retard the magnefclaatlon and demiffnetiMtioin of the cores, k k*, and consequently lengthen the induoed cuiwnM thrown into c and C by the acticMi of e* and «.

" llaring thus compensated for circuit No. 1. the ooinp«-sation for circuit No. 2 is exactly aimiUr. If the latter^ euit does not affect the telephone circuit aa •trooglj •• No.

INDUCTION BALANCE.

497

INJECTOR.

1, ihe «leetro-iiiagDet«,/and/', are placed a greater dbUnoe from k and k* ; the latter mar be elongated, and oompenn-tion attained from many cireuitB by employing leparate magiMts in each circuit which aflects the telephonic drcuit."

Fig. 1445 shows Prof. Haghes' apparatus. It consists of coils of wire, a telephone, a microphone, a three^sell Daniell hattery, and a galTanometer, and was oonstmcted by Prof. Hughes, to practically demonstrate his principle of compensation. The subject is carefully described, and the principles of the apparatus well treated in **Engineering" March 14, 1879.

** The llTe rinn of ininlated iron wire attached to the bcaid—on the zight, in the penpeotire riew, Fig. 1446 — reprasent three llnee of telegraph running paraUel. The

Fig. 1446.

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