. The Bell System technical journal. Telecommunication; Electric engineering; Communication; Electronics; Science; Technology. ELECTRIC WAVE FILTERS 273 angle of approximately 60° about its horizontal axis. On this rotor was wound a large number of turns of small gauge wire, and the winding was short-circuited. A coil of this type is shown in Fig. 7. The coupling between the rotor in its horizontal position and the main coil is very small, and therefore the effective inductance between terminals is practically that of the main coil. However, if the rotor is rotated in such a way that its plane
. The Bell System technical journal. Telecommunication; Electric engineering; Communication; Electronics; Science; Technology. ELECTRIC WAVE FILTERS 273 angle of approximately 60° about its horizontal axis. On this rotor was wound a large number of turns of small gauge wire, and the winding was short-circuited. A coil of this type is shown in Fig. 7. The coupling between the rotor in its horizontal position and the main coil is very small, and therefore the effective inductance between terminals is practically that of the main coil. However, if the rotor is rotated in such a way that its plane becomes more nearly parallel. Fig. 7—Photograph of "AA" coil. with that of the main coil the coupling between it and the main coil is increased, and the effective inductance of the whole is reduced. It is possible to vary continuously the inductance of a coil of this design over a range of about 3-2 per cent. When coils of this type and their associated condensers are connected together as they would appear in a filter, their resonant frequency or frequencies are located by an adjustment of the coil or coils in the mesh. If the mesh contains more than one adjustable coil, more than. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original American Telephone and Telegraph Company. [Short Hills, N. J. , etc. , American Telephone and Telegraph Co. ]
Size: 1488px × 1679px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
