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Antique induction coil used in schools from around 1900, Bremerhaven, Germany. An induction coil or "spark coil" (archaically known as an inductorium or Ruhmkorff coil [1] after Heinrich Rühmkorff) is a type of transformer [2] [3] [4] used to produce high-voltage pulses from a low-voltage direct current (DC) supply.
Heat coils, also known as protectors, bugs or carbons serve as a surge protector between the telephone exchange and outside plant.They are commonly the last point of appearance for a telephone circuit before it leaves the office, for example on the outside plant side of the main distribution frame.
A Helmholtz coil Helmholtz coil schematic drawing. A Helmholtz coil is a device for producing a region of nearly uniform magnetic field, named after the German physicist Hermann von Helmholtz.
An ignition coil consists of an iron core surrounded by two coils (windings) made from copper wire.The primary winding has relatively few turns of heavy wire, while the secondary winding consists of thousands of turns of smaller wire and is insulated from the high voltage by enamel on the wires and layers of oiled paper insulation.
The magnetic field lines (green) of a current-carrying loop of wire pass through the center of the loop, concentrating the field there. An electromagnetic coil is an electrical conductor such as a wire in the shape of a coil (spiral or helix).
The Strange as It Seems syndicated comic strips were printed daily in newspapers from 1928 to 1970. [1] They were originally created by John Hix. Strange as It Seems was distinguished for its adherence to Hix's standard that every published fact be verified by a minimum of three sources.
"Sticks Nix Hick Pix" is a famous [1] headline printed in Variety, a newspaper covering Hollywood and the entertainment industry, on July 17, 1935, over an article about the reaction of rural audiences to movies about rural life.
Mosquito coil Mosquito coil. A mosquito coil is a mosquito-repelling incense, usually made into a spiral, and typically made using dried paste of pyrethrum powder. The coil is usually held at the center of the spiral, suspending it in the air, or wedged by two pieces of fireproof netting to allow continuous smoldering.