. A text book of physics, for the use of students of science and engineering . usual to use a transformer or induction coil, as shownin Fig. 954. C is the induction coil, the low resistance primaryof which is in series with the microphone M and a battery. Thesecondary, consisting of many turns, is in series with the line and the receiver at the other end of theline. In the position shown,the receiver R is supposed tobe in use. When not in useit is hung up on the key K,which then throws the induc-tion coil out of circuit andjoins the line to the key K2,and the distant station canthen call up, s
. A text book of physics, for the use of students of science and engineering . usual to use a transformer or induction coil, as shownin Fig. 954. C is the induction coil, the low resistance primaryof which is in series with the microphone M and a battery. Thesecondary, consisting of many turns, is in series with the line and the receiver at the other end of theline. In the position shown,the receiver R is supposed tobe in use. When not in useit is hung up on the key K,which then throws the induc-tion coil out of circuit andjoins the line to the key K2,and the distant station canthen call up, since the line isin series with the electric bell3. To call up the distant station, the button of the key K, mustbe pressed. This puts the battery in series with the line and theelectric bell at the distant station. Arc lamps.—Whenever an electric circuit is suddenly broken aspark occurs, owing to the inductance in the circuit (p. 986). Asi rule this spark is very soon quenched; but if the electromotiveiorce in the circuit is sufficiently high, and the materials where the. Fig. 954. —Transformer in telephone circuit. 1012 MAGNETISM AND ELECTRICITY CHAP.
Size: 2150px × 1162px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, bookpublishe, booksubjectphysics
