STERN   TUBE

4:73

with a cock on it to enable the engineer to draw water from the stern
tube, so that its temperature may be tested to ascertain if the bearings
are working cool. A strong massive nut G screwed on to the end o*
the shaft prevents the propeller from working oft.

Fig. 74 —Twm Screws.
Refer to the profile of Caledonian Monarch and note the stern tube
and the spare tail shaft stowed in the recess at the after end of the
tunnel. To unship a propeller hi drydock the nut must be unscrewed
and the propeller slung by tackles hooked on to eyebolts for the purpose
on each side of the ship's stern. Tne gland is unscrewed and the tail
shaft uncoupled from its adjoining length of shafting, and which has
M/D3Hlf>   BULKHEAD

Fig. 75 —Stern Tube for Side Screw.
also to be removed to allow of the tail shaft being drawn straight forward,
leaving the propeller suspended by the tackles. Repairs and rebushing
of the tail shaft can then be executed.
The other lengths of shafting pass through bearings supported on
widely spaced stools, the forward length being coupled to the thrust shaft