226 THE PROPELLING MACHINERY OF THE U. S. S. LEVIATHAN. 



7 feet clear from the bulkhead, and on this plate are mounted the valve wheels, pres- 

 sure gauges, etc. 



Directly over these hand wheels, on the roof of the engine-room is a diagram- 

 matic model of the turbines, each unit of which is lighted up by electric light lamps, 

 under the different methods of operation (Fig. 12, Plate lOo)'. 



For instance, in "Triple-Series Connection" the words "Triple-Series Connec- 

 tion" show a white light, and all the rest of the model is dark. Immediately the 

 high-pressure regulator is opened the four ahead turbines are lighted up, and, if this 

 order came from the chart house or bridge, then the word "Ahead" is also 

 lighted up. When maneuvering, the words "Maneuvering Connection" show a white 

 light, and, if the port ahead engines are to be used, the bridge signal lights up the 

 port "Ahead," and when the starboard astern signal is given the word "Astern" is 

 lighted, and on opening this valve these engines show a red light. Again, for inde- 

 pendent operation, the words "Single (Connection" are lighted up, and on opening 

 any of the regulator valves that engine is immediately lighted. 



Four lines of steam pipes pass the steam from the boilers over to the engine- 

 room, two on the port side and two on the starboard side. The stop-valves connect- 

 ing with these steam lines are in the engine-room, and they are operated 

 hydraulically. 



A cross-connection pipe runs between the port and starboard valves. From 

 each of these valves the steam passes into a steam strainer chest combined with 

 an automatic trip valve, which has connections to the five main regulator valves 

 of the turbines. 



Fig. 13, Plate loi, is a photograph showing the arrangement of the hand 

 wheels. Commencing on the port side they are as follows: — 



1. Port high-pressure astern. 



2. Port high-pressure ahead. 



These two valves connect directly to the port side boiler stop-valves. 



3. High-pressure ahead, from starboard side stop-valves. 



4. Mid-pressure ahead. 



5. High-pressure astern. 



Fig. 14, Plate 102, illustrates the general design of the turbine regulator valves. 



The by-pass valve is operated by the smaller hand wheel, arranged on an in- 

 ternal spindle passing through the stem of the main valve. The hand wheels are 

 connected to the valve spindles through miter wheels and ordinary spur gears. 



The six hand wheels on the lower row admit steam to the low-pressure ahead 

 and low-pressure astern turbines when these are being operated in single connection, 

 the two end wheels being shut-off valves to these lines. These valves are only 

 used in an emergency. 



The five small wheels arranged below the others operate the hydraulic cylin- 

 ders of the change valves. The central one connects to the double change valve of 

 .the mid-pressure turbine (Fig. 15, Plate 102). 



Fig. 13, Plate 10 1, shows the various water pipes connecting with these 



