Figure 4-32.--Wiring diagram for a 12-inch mercury-xenon arc searchlight.
location of the ship. Darkened ship condition is
A screen hood is provided for attachment to the front
door to limit the candlepower of the beam, to cut down
achieved by the following means:
its range, and to reduce stray light, which causes
1. Light traps that prevent the escape of light from
secondary illumination around the mainbeam; the hood
illuminated spaces
also allows for the use of colored filters.
2. Door switches that automatic-ally de-energize
the lights when the doors are opened
DIVERSIFIED LIGHTING
When darkened-ship condition is ordered, check
EQUIPMENT
every door switch installation aboard ship to determine
Diversified lighting equipment restricts the
that all lock devices or short circuiting switches are set
visibility of light and reduces the amount of glare or
in the DARKENED SHIP position.
background illumination. This equipment includes
Inspect the light traps to determine that they are free
lights for darkened-ship condition and special lights for
various uses.
of all obstructions. A light-colored object of any
appreciable size placed in a light trap might be
sufficiently illuminated by the interior lighting to be
DARKEN SHIP EQUIPMENT
visible beyond the safe limit. Note the positions of the
hand lanterns when entering a compartment so that you
Darkened ship is a security condition designed to
can find them without delay when they are needed.
prevent the exposure of light, which could reveal the
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