Carl A. Clark.

The next proceeding will be to fit up the boiler with steam gauge, safety valve, water glass, etc. It is recommended that the fittings be purchased of some of the dealers in such articles, as they are extremely fussy and difficult to make, and cost very little to buy.

The safety valve should be fitted in the position marked on sketch shown in the previous chapter, and should be set for 50 lbs. pressure per square inch. If screwed in, the hole in the boiler should be topped the correct size, and the valve screwed in tightly, after being smeared with red lead. The steam gauge is tapped in at any convenient place, in the steam space, preferabty somewhere on the front bead. There are frequently set on tube extension so as to be seen on deck. It should indicate up to 75 lbs. per sq. inch, that it may be used in testing. The water column is attached in the position shown by the two holes just above and below the water level. It must, of course, be brought out beyond the uptake, either in front or to one side.

The feed d pipe is attached at the small reenforcing piece just below the uptake. From the point marked "steam outlet" the steam is taken; a small valve is put on next to the boiler to regulate or cut off the supply of steam to the engine. The steam pipe is a brass or copper pipe about J" diameter, bent to shape, and running from the valve on the boiler to the steam inlet on the engine or turbine.

The means for feeding the boiler next requires at" tention. A small pump is to be used, run by a belt from the shaft of the engine. This means is suggested, as the adjustment of the pump to give the correct amount of feed must be done by trial, and by varying the sizes of the pulleys driving the pump. After it is once adjusted it will be nearly automatic for all speeds of the engine. This feed pump draws from a tank which is placed in some convenient part of the boat and discharges into the boiler through the feed pipe before mentioned. The pump must be so adjusted as to maintain the water level at the point marked, and neither flood the boiler, nor allow it to run dry, as the latter is a source of great danger. The tank should be of fairly large capacity, as the steam is thrown away after passing through the engine. The pipes for the feed pump can be about 1/8" diameter.

For the burner, a rather large alcohol lamp is needed. There are several ways of making these, but the simplest is as follows. A sort of pan is made about 4" long, 2 J" wide and 5/8" deep with flaring sides. It rests in the furnace just below the centre with short legs to keep it away from the furnace side and admit air around it. From this pan a 1/8" pipe leads to the reservoir of alcohol several inches away. This pipe has a cock or valve in it to regulate the supply of alcohol. The pan is now filled nearly full of asbestos wool, and a piece of wire gauge is set on top to keep it in place. A shield is to be arranged to cover the mouth of the furnace and prevent the flame coming out. Air must however, be freely admitted both above and below the lamp. If the burner smokes it shows that too much alcohol is being used for the amount of air present.

It will probably be found that on first starting up the boiler the draft will be poor and some means must be taken to accelerate it, either by passing or exposing to a brisk wind, but after the boiler and stack become warm, no trouble should be found. The exhaust from the engine may be carried into the stack and made to assist the draft. If desired, a whistle and other accessories may be fitted.