Page 216 - Introduction to Marine Engineering

Deck machinery and hull equipment 199

Diaphragm

Bridge

Bridge ffSwitch
wing

(b) Signal control system
Figure 10.15 Whistle

arrangements as required. The whistle switches are usually on the
bridge wings and inside the bridge. The whistle is also arranged for
direct operation from a lanyard which extends from the bridge. The
compressed air supply can vary in pressure over a considerable range
without affecting the whistle operation.