TM 55-1905-223-24-14
(7) Bearing Repeater. Three bearing repeaters mounted in pelorus stands are located as shown in FIGURE 1-3.
One repeater is located on each bridge wing of. the ship (port and starboard) and one repeater is located on top of the
pilot house to the port side of the binnacle. The bearing repeater (FIGURE 1-11) consists of a step motor geared to a
compass card and contained in a watertight case. The repeater is gimbal-ring-mounted on a pelorus stand. An integral
cable is provided for interface to the gyro compass transmission system at the pelorus stand. A synchronizing knob is
located on the side of the repeater to synchronize the repeater with the gyro compass.
(8) Pelorus Stand. Three pelorus stands are located as shown in FIGURE 1-3. Each pelorus stand (FIGURE 1-
12) is deck-mounted with eight bolts. The stand consists of the repeater support and column assembly. The repeater
support provides mounting for the bearing repeater. The column assembly contains a cover plate and gasket for access
to internal wiring for the repeater lighting dimmer circuit. The rheostat is mounted on the cover plate with a knob secured
to the rheostat shaft on the outside. A stuffing tube is provided for cable access to the stand.
(9) Open Scale Repeater. One open scale repeater is located as shown in FIGURE 1-3, mounted in a bulkhead
mounting bracket. Another open scale repeater is located as shown in FIGURE 1-4, Steering Gear Room. Each open
scale repeater (FIGURE 1-13) consists of a step motor geared to a compass card and a mask. The heading is read from
the exposed numeral and the number of graduations from the numeral to the rubber line. The repeater is red-lighted by
three incandescent lamps with red lens covers. The lamp intensity is varied by the internal dimmer circuit controlled
from a rheostat on the bulkhead mounting bracket. The repeater is yoke-mounted and can be adjusted for ease of
viewing from the helm or at the emergency steering station. The enclosure is splashproof but not watertight. It is not
designed to be mounted in a pelorus stand. A synchronizing knob is provided on the enclosure for synchronizing- the
repeater with the gyro compass. An integral cable is provided with stuffing tube to interface the repeater with a terminal
board located in the bulkhead mounting bracket.
(10) Bulkhead Mounting Bracket. The bulkhead mounting bracket (FIGURE 1-14) consists of a yoke and
housing assembly. The yoke supports an open scale repeater. The housing assembly contains internal circuitry for
power and compass data for the repeater. External controls on the housing assembly include a power toggle switch with
cover and a knob for the internal rheostat to control repeater lamp intensity. Three holes are provided for mounting bolts.
A stuffing tube assembly and cable receptacle are located on the upper end of the housing assembly for gyro compass
data and for power cable and repeater cable access.
(11) Azimuth Circle. The azimuth circle (2, FIGURE 1-15) is a Navy standard type that is kept in a wooden box
(1) for protection when not being used. The azimuth circle (2) is an instrument used for determining both bearings of
terrestrial objects and azimuths of celestial objects. It consists of a non- magnetic ring formed to fit snugly over the top of
a compass bowl (magnetic compass) or onto the top of a gyro compass bearing repeater, about which it can be turned to
any desired direction. The azimuth circle inner lip (8) is graduated from O degrees to 360 degrees, counterclockwise, for
measuring relative bearings. On one diameter of this lip is mounted a pair of sighting vanes, consisting of a peep vane
(3) and a far vane (6) with a vertical wire mounted in its frame.
1-16
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