Figure 10-12.--Rudder angle order Indicator (circuits L and N).

Figure 10-11.--Rudder angle indicator (circuit N) and rudder angle order (circuit L).

STEERING EMERGENCY ALARM

SIGNAL CIRCUIT

The steering emergency alarm signal circuit

(circuit LB) provides a means by which the pilothouse

can alert the steering gear room watch that a

steering emergency has occurred and that the trick

wheel must be used to steer the ship.

A spring return lever switch is located on the

steering control console, and a siren is located in the

steering gear room. The helmsman operates the switch

to energize the siren when normal steering control is

lost. When the siren sounds in the steering gear room,

the steering gear room watch immediately engages the

trick wheel and takes control of steering the ship.

GEARS

Since gears are used in most of the equipment that

we are discussing in this chapter for changing the

Figure 10-12.--Rudder angle order Indicator

direction or speed of an input, or for converting an

(circuits L and N).

electrical input to a mechanical input and vice versa,

it is essential that we discuss the different types of

gears and their functions.

steering gear room watch can anticipate a

rudder angle order change. When operated, the

FUNCTIONS OF GEARS

transmitter sends the desired rudder angle in

degrees left or right to the combination rudder

Gears have three functions: they change the

angle order indicator in the steering gear room.

direction of motion; they change the speed of motion;

The steering gear room watch then positions the

and they change the force by changing the

trick wheel to cause the rudder angle order

mechanical advantage.

indicator to match the order.