Images Dated 5th June 2007

Campbell standard of mutual inductance

Campbell standard of mutual inductance. Mr A. Campbell designed this standard of mutual inductance in 1907-8. Two single-layer copper coils (upper and lower centre) are wound onto the outside of a marble cylinder containing a multiple-layered inner copper coil (not seen). The current passing through the inner coil induces a specific voltage in the outer coils. This phenomenon is known as mutual inductance. The Campbell standard of mutual induction was used to determine the Ohm (a unit of electrical resistance). Photographed in 1960

© NATIONAL PHYSICAL LABORATORY CROWN COPYRIGHT/SCIENCE PHOTO LIBRARY

A Marine attaches an M-240G medium machine gun to the turret of his humvee

Fire Base Gloria, Marine Corps Base Camp Pendleton, California, June 6, 2007 - A Marine attaches an M-240G medium machine gun to the turret of his humvee before moving out to conduct a raid

© Stocktrek Images

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HINDU UNIVERSE. Hindu cosmogram depicting the tortoise, Akupara, supporting the

HINDU UNIVERSE.
Hindu cosmogram depicting the tortoise, Akupara, supporting the elephants upon which the earth rests, enclosed by the world-serpent, Asootee. Drawing from an ancient Hindu ceramic

© none

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