Archivo:Variometer.jpg

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Variometer.jpg ‎(360 × 476 píxeles; tamaño de archivo: 20 kB; tipo MIME: image/jpeg)

Resumen

DescripciónVariometer.jpg	English: A variometer, an adjustable air core inductor used in radio equipment, from a 1920 book on radio. It was widely used in radio receivers during the 1910s and 20s. Today it is mostly used in transmitter antenna tuners and matching sections for low frequency antennas, to match the transmission line to the antenna. It consists of two coils of wire with the same number of turns, connected in series. The inner coil is mounted on a vertical shaft that allows its axis to be turned with respect to the outer coil. When the inner coil's axis is parallel to the outer coil and their magnetic fields are in the same direction, their magnetic fields add, so their inductance is maximum. When the inner coil is turned so that it's axis is at an angle to the other, the mutual inductance between them is smaller so the total inductance is less. When the inner coil is turned 180° so its axis is parallel with the outer but their magnetic fields are in opposite directions, they subtract so the total field, and thus the total inductance, is very small. Thus the inductance can be continuously adjusted over a wide range.
Fecha	1920
Fuente	Downloaded April 30, 2013 from Elmer Eustace Bucher (1920) The Wireless Experimenter's Manual, Wireless Press, Inc., New York, p. 189, fig. 150a on Google Books
Autor	DesconocidoUnknown author

Public domain	Este archivo está en el dominio público en los Estados Unidos. Esto se aplica a los trabajos de Estados Unidos donde los derechos de autor han expirado, a menudo porque su primera publicación ocurrió antes del 1 de enero de 1929. Véase esta página para explicación adicional.	United States
	Esta imagen puede estar protegida fuera de los Estados Unidos —especialmente en Canadá, China (excepto Hong-Kong, Macao, o el área de Taiwán), Alemania o Suiza—. El creador y el año de publicación son información esencial y deben ser proporcionados. Véase Wikipedia:Derechos de autor para más detalles.