The pump E is fixed at the bottom midway between the engine uprights as indicated in [Fig. 124]. The suction-pipe passes through a hole and down through the deck nearly to the bottom of the hull. After the engine and boiler are connected, a trial can be made. If the foregoing instructions have been carried out, the engine will run at a good speed and a continuous flow of water will be pumped out of the hull. All parts of the engine and pump should be carefully oiled and water should be poured into the pump in order to prime it before its start.
It is understood that two complete boilers and pump units are made for the model, and one is mounted on each side. If the builder desires to increase the capacity of the pumps and install a more powerful boiler and engine, only one pump will be necessary. Otherwise the water will not be pumped from the hull very rapidly.
When the builder has finished the pump units, he should turn his attention to the remainder of the fittings. Two small cranes are made, and one is placed at each side of the hull. They are made of tin. The cab of each crane measures 21/2 inches high by 2 inches long by 13/4 inches wide. A small roof is fitted on, and a piece of wood fitted to the bottom to serve as a floor. The jib measures 6 inches long by 3/4 inch at the base, and tapers to 1/2 inch. It has 1/4 inch turned down at each side, thus adding considerable strength. The jib is fitted to the cab by means of a wire passed through the sides, and two guy-ropes are arranged as shown. A small piece is now cut out at the top, and a pulley wheel fixed in position by means of a pin passed through the sides.
The winding-drum can be made of either tin or wood. The axle passes through both sides of the cab, the crank being attached to the outside. [Fig. 126] shows the completed crane, which is held to the deck by means of a small bolt and nut. A washer should be placed between the bottom of the crane and the deck, to allow the crane to turn freely with little friction.
A hand-rail, made of fine brass wire, is placed around the deck.
Dummy port-holes are fixed to the sides of the dry-dock for the purpose of lighting up the interior of the engine-room. These are furnished from top rings taken from gas-mantles. Anchor-chains are fixed at each end of the dry-dock. The whole dry-dock is painted with two coats of gray paint and the water-line painted in bright red.
