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Other companies had previously built carbon arc searchlights, but Carlisle & Finch added the innovation of mounting the carbon electrodes horizontally on the beam axis. The tip of the positive carbon faced the reflector, maximizing the amount of light reflected, and spacing of the carbons was adjusted by motorized screw-feed mechanisms. [15]
A searchlight (or spotlight) is an apparatus that combines an extremely bright source (traditionally a carbon arc lamp) with a mirrored parabolic reflector to project a powerful beam of light of approximately parallel rays in a particular direction. It is usually constructed so that it can be swiveled about.
In a carbon arc lamp, the electrodes are carbon rods in free air. To ignite the lamp, the rods are touched together, thus allowing a relatively low voltage to strike the arc. [1] The rods are then slowly drawn apart, and electric current heats and maintains an arc across the gap. The tips of the carbon rods are heated and the carbon vaporizes. [1]
The searchlight included a sophisticated system to control the carbon arc lamp, extending the carbon electrodes to keep a constant arc distance as the ends of the electrodes burned away. [2] The 8 kilowatt, direct current generator that powered the searchlight was driven by a six-cylinder, BMW engine, of a type used in pre-war cars.
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The searchlight turret included a station for an operator, who had the task of changing the light's carbon electrodes when they burned out. [1] The light emerged from a vertical slit that was just 2 inches (5.1 cm) wide by 24 inches (61 cm) tall, a small size which reduced the chance of battle damage to the optical system.
In 1927 he began selling incandescent tungsten lighting to the film industry, which allowed a more natural lighting than the previous arc lights. The new lights were also silent, an advantage for the new sound films. [1] Mole-Richardson invented the Fresnel Solar Spot unit in 1935, adapting the fresnel lighthouse lens for use in motion pictures.
A M3 Grant tank modified with a carbon arc searchlight and dummy turret gun, codenamed Canal Defence Light. In 1583, during the Ottoman–Safavid War (1578–90), the Ottoman Empire used lanterns to defeat a Safavid army in a night time encounter, that became known as the Battle of Torches.
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