in NAVSEA symbil number order along with the MS or
top of the lantern case (fig. 4-34, view D). The 115-volt
NAVSHIPS drawing number, and NSN.
ac version is identified by symbol 101.2. Symbol 102.2
identifies the 115-volt dc type. A three-conductor cable
Floodlights
(including a green conductor to ground the relay metal
frame) is provided for the connection to a lighting
circuit. THE RELAY-CONTROLLED LANTERN
The white floodlight (fig. 4-34, view A), symbol
MUST ALWAYS BE INSTALLED WITH THE
300.2, consists of a splashproof housing equipped with
RELAY UPRIGHT. This specific arrangement of the
a rain-shielded hinged door secured with a latch. The
relay prevents a fire hazard, caused by a chemical action
300-watt lamp is a sealed-beam type. The lamp housing
of the electrolytic paste leaking from the battery case to
is trunnioned on a yoke, which in turn is mounted on a
the relay housing as the battery is being discharged
shock-absorbing base. The light is held in elevation by
a clamp on the yoke. Train positioning is accomplished
(operated).
by friction within the shock-absorbing base. Each
Relay-controlled lanterns are installed in spaces
floodlight is furnished with a three-conductor cable
where continuous illumination is necessary.
(including a green lead to ground the metal housing) for
connecting into a lighting circuit.
These spaces include essential watch stations,
control rooms, machinery spaces and battle dressing
Floodlights with 300 watts (symbols 263 and 303),
stations. The lanterns must illuminate the tops and
150 watts (symbol 317), and 200 watts (symbol 69) are
bottoms of all ladders and all flush-mounted scuttles.
also used. Floodlights are installed on weather decks at
They must also be mounted to illuminate all gauges at
suitable locations to provide sufficient illumination for
vital watch stations. Operating personnel will depend
the operation of cranes and hoists, and the handling of
on these lanterns for illumination when bringing
boats.
machinery back on the line after a casualty. These
lanterns must not be installed in magazine or
Hand Lanterns
powder-handling spaces where fixed or semi-fixed
ammunition is handled, or in any location where
Two types of dry battery powered lanterns are
explosion-proof equipment is installed.
available for installation in certain strategic locations to
prevent total darkness if all lighting fails. One type is
The lantern relay is connected in the lighting circuit
hand operated, while the other is operated automatically
(in the space in which the lantern is installed) on the
by a relay when power to the lighting distribution system
power supply side of the local light switch that controls
fails.
the lighting in the space concerned. Thus, the relay
The manually operated portable lantern (fig. 4-34,
operates and causes the lamp in the lantern to be
view B), consists of a watertight plastic case containing
energized from its batteries only when a power failure
two 6-volt batteries connected in parallel. It includes a
occurs, not when the lighting circuit is de-energized by
sealed-beam lamp, rated at 5 volts, but operated at 6
the light switch. If the space is supplied with both
volts (when the batteries are new) to increase the light
emergency and ship's service lights, the lantern relay is
output. A rigid handle is secured to the top of the case.
connected to the emergency lighting circuit only.
The lantern is operated by a toggle switch with the lever
positioned near the thumb for ease of operation. When
The lantern relay should be fused so that a short
the batteries are new, the lantern can be used
circuit in the relay leads of one compartment will be
cleared through low-capacity fuses before the fault
continuously for about 8 hours before the light output
ceases to be useful.
causes heavier fuses nearer the source of power to blow
and cut off the power supply to lighting circuits in other
Manually operated lanterns are installed as an
compartments. The fuses that protect the branch
emergency source of illumination in spaces that are
circuits are ample protection for the lantern relay. A
manned only occasionally. These lanterns are also used
lantern relay can be connected directly to the load side
in certain areas to supplement the relay-operated
of the fixes in fuse boxes or switchboxes. If a relay
lanterns. You should not remove manual] y operated
cannot be connected to a branch circuit, it can be
portable lanterns from their compartments unless the
connected to the source side of a fuse box or other point
compartments are abandoned permanently.
on a submain. If the submain supplies lighting no more
The relay-operated lantern is similar to the manually
than one compartment, separate fuses must be installed
in the relay circuit.
operated type except the relay housing is mounted on
4-38
