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Furthermore, a doctor, nurse or medical equipment easily blocked the light. The use of mirrors on the four corners of the ceiling to reflect sunlight towards the operating table only slightly alleviated these problems. Attempts were made to use an optical condenser in an indirect light to reduce the heating, but without success.
In use, the patient sits and faces the physician. A bright lamp is positioned adjacent to the patient's head, pointing toward the physician's face and hence towards the head mirror. The light from the lamp reflects off the mirror, along the line of sight of the user, with the light being somewhat concentrated by the curvature of the mirror.
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ATS officers-in-training crew a 90 cm searchlight in Western Command, 1944. 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.
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