Side Lever -
The engine in the museum is the port engine. The starboard engine has been fully restored, with a makeshift paddle wheel, and is on display in the National Maritime Museum, Greenwich, where it is turned over by electric motor.
These engines were popular during the mid 1800's until they were superseded by the more compact, fuel-
(i) The air pump, which maintains the vacuum in the condenser.
(ii) The boiler feed pump which maintains the water level in the boiler.
(iii) The bilge pump, which removes water that accumulates in the bottom of the boat.
(iv) The cooling water pump, which forces cold water through the condenser, to cool the steam and create a vacuum.
It is unusual to see an example of this type built and installed as late as 1907.
Type of Engine:-
Builder & Year:-
Single cylinder, surface condensing, side-
Hepple & Sons of South Shields
30 ins diameter
Slide valve, with an expansion valve is fitted in the same steam chest.
The end of the piston rod is connected to a cross-
Further along the side-
A loose eccentric on the paddle shaft works the main slide valve for both ahead and astern rotation. The valve is operated, from the eccentric, through lever arms and a balance weighted shaft. The slide valve can be disconnected from the eccentric rod by lifting a 'gab' off a pin on the weighted shaft. The slide valve can then to be moved by hand, using a long lever at deck level. This allows the engine to be started in the required direction.
An expansion valve is fitted in the same steam chest as the main slide valve and is driven by a fixed eccentric. The expansion valve was used for forward motion only, and when both the port and starboard engines were coupled. The expansion valve could be put out of operation when (i) the main slide valve is operated by hand; (ii) when running astern and (iii) when both engines were disconnected. In addition to this the valve could be adjusted to vary the steam cut-
The vertical cylinder sits on top of the surface condenser, which, in turn, is mounted on a hollow base. This hollow base connects the cold water circulating pump to the condenser and connects the condenser to the air pump.
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