lights. Supply switches for these lights are located on
the signal and anchor light supply and control panel (in
the pilothouse). The switches are individual on-off
rotary snap switches.
The aircraft warning lights (red) for ships are
32-point (360°) lights installed at the truck of each mast
that extends more than 25 feet above the highest point
in the superstructure. Two aircraft warning lights are
installed if the light cannot be located so that it is visible
from any location throughout 360° of azimuth. The
fixtures are spraytight and are equipped with multiple
sockets provided with 15-watt, 1-filament lamps.
Blinker lights for ships are located on the yardarms.
They are used in sending flashing light messages.
The breakdown and man-overboard lights (red) for
ships are 32-point (360°) lights located 6 feet apart
(vertically) and mounted on brackets that extend abaft
the mast or structure and to port. This arrangement
permits visibility, as far as practicable, throughout 360°
of azimuth. The fixtures are spraytight and are equipped
with 15-watt, 1-filament lamps. When these lights are
used as a man-overboard signal, they are pulsed by a
rotary snap switch (fitted with a crank handle) on the
signal and anchor light supply and control panel.
The steering light (white) for ships is installed on
the jackstaff or other spar or structure and must be
visible to the helmsman in the pilothouse. The light is
installed on the centerline if the pilothouse is on the
centerline. If the pilothouse is not on the centerline, a
vertical plane through the light and the helmsman's
station in the pilothouse must be parallel to the keel line.
The fixture is spraytight and includes a disk screen with
a 3/64- by 1-inch slot (opening) through which light is
emitted from a 2-candlepower lamp. A suitable bracket
is provided with which the light is mounted on a
jackstaff (1/2 inch in diameter).
The stem light (blue) for ships is a 12-point (135)
light similar to the white stern light (fig. 2-16, view C)
described previously. The light is installed near the stem
on a ship that is engaged in convoy operations. It is
mounted to show an unbroken arc of light from dead
astern to 6 points on each side of the ship.
The wake light (white) for ships is installed on the
flagstaff or after part of the ship to illuminate the wake.
It is so mounted that no part of the ship is illuminated.
The fixture is tubular and spraytight. One end of the
fixture has an internal screen with a l-inch-diameter
hole and a 2 5/16-inch-diameter by 3/8-inch-thick lens,
through which light is emitted from a 100-watt,
2-filament lamp. A suitable mounting bracket is
included, with which the position of the light can be
adjusted. Thus, the wake light puts a target in the
Speed lights for the ships are combination red (top)
and white (bottom), 32-point (360°) lights. They are at
the truck (top) of the mainmast unless height of the
foremast interferes with their visibility; in that case,
they are located at the truck of the foremast. Two speed
lights are installed if their light cannot be located so that
they are visible throughout 360° of azimuth.
Speed lights are provided to indicate, by means of
a coded signal (as in table 2-2), the speed of the vessel
to other ships in formation. In other words, they indicate
the order transmitted over the engine order system. The
white light indicates ahead speeds. The red light
signifies stopping and backing.
The speed light is used as an aircraft warning light
to provide a steady red light when the signal selector
switch is placed in the stop position and the circuit
control switch in the aircraft warning position.
The forward and after anchor lights (white) for
ships are 32-point (360°) lights. The forward anchor
light is located at the top of the jackstaff or the forepart
of the vessel; the after anchor light is at the top of the
flagstaff. Each of the splashproof fixtures is provided
with a 50-watt, 1-filament lamp. Anchor lights are
energized through individual on-off rotary snap
switches on the signal and anchor light supply and
control panel in the pilothouse.
Standing lights are dim, red lights installed
throughout the interior of the ship or white lights
installed on exterior deck passageways. The general
purpose of standing lights is to provide the following:
1. In berthing spaces, the red lights provide just
enough light to permit safe movement of personnel
within the space when the regular lighting is
2. On the limited number of established routes
between the berthing spaces and the weather stations,
with reduced light contrast between the interior of the
vessel and the dark outside deck. The purpose of the
reduced light contrast is to reduce to a minimum the
period of blindness experienced by ship's personnel
going to stations on the outside deck.