[Rebelbase]

Thank-you for posting that. Onevike has additional comment and photos at #33 above.

[PeterPrinciple]

http://www.victorysearchlights.com/victory2.html

Heat Detecting Locator

Heat detectors were used to locate enemy aircraft. Looking like a searchlight, this device swept the sky to detect heat from the engines of enemy aircraft. Thermopiles and control equipment designed by the Signal Corps Laboratories were mounted in mechanical structures previously built by the General Electric Company on an Engineer Contract. As operated in 1937, the heat detector received directional data from the radio equipment and in turn controlled the pointing of a searchlight.

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Here is inf0 our our heat detection equipment