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12-INCH MERCURY-XENON ARC SEARCHLIGHT - 14244_24
Figure 2-3.Starter unit for 12-inch mercury-xenon searchlight

Signalman 3 & 2 - Aviation theories and other practices
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Five resistors are connected in parallel and are, in turn, connected in series with the lamp. These resistors limit the current at starting and during operation, and supply the correct electrical values to the lamp. 12-INCH MODIFIED MERCURY- XENON SEARCHLIGHT Some of the older mercury-xenon searchlights are 12-inch, incandescent lamp searchlights converted to use a 1,000-watt, compact, mercury-xenon arc lamp (fig. 2-2). The addition of a small amount of mercury to xenon in a gaseous discharge arc lamp produces a much more brilliant light with a great deal of radiation in the green and ultraviolet parts of the spectrum. The increase in light intensity greatly increases the range of the searchlights. The modifications made to convert the searchlight include the installation of a lamp holder, lamp adjuster assembly, and lamp starter assembly mounted on the searchlight drum. Other modifications include the following: 1. Providing a 115-volt, 60-Hz ballast unit to be mounted below the deck near the searchlight and connected to it by a flexible cable. 2. Installing the short-arc mercury-xenon lamp. 3. Furnishing the additional onboard repair parts necessitated by the changes. (The electrical components include a ballast, transformers, capacitors, spark gaps, and switch circuits.) Figure 2-2 .—12-inch modified mercury-xenon arc searchlight. 2-3







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