A piece of fine wire gauge is to be fastened over the end of the pipe to prevent dirt from filling it. It is also advisable, but not absolutely necessary, to have a valve on this water inlet next to the plank; this valve, when closed, prevents all chance of the boat being flooded oy accident when not in use. The outlet from the engine leads outboard above the water line. The vaporizer is located near the base of the engine, and is connected to the tank by a small lead or brass pipe. Lead is preferable, as is easily bent to fit into place. There should be a stop-cock at the tank and at the vaporizer, and the pipe is connected to these by a wiped joint and union. There must be as few joints as possible in the gasoline pipe, as leakage at this point is very dangerous. The pipe should be placed under the seat on one side, running through holes bored in the moulds at about the height of the vaporizer, to avoid all low places, which pocket gasoline.

The vaporizer has also an air inlet which admits air, this may sometimes take air from around the muffler, but ordinarily has merely an open pipe. This pipe is to be led into a sheltered place to protect it from spray, and it must also be so placed that waste or cloths will not be drawn into it by the suction. It might well be led into one of the side lockers and a portion of it partitioned off.

All joints in water pipes should be screwed together with a coating of red lead between; joints in the exhaust pipe should be tight, but need nothing in them, in the gasoline pipe all joints should be wiped with solder, except those made by the unions themselves where a leather washer is used.

In fitting up the electric ignition, it should be borne in mind that a large proportion of the trouble with gasoline engines is caused by some defect in the electric system. The electric supplies are usually included in the outfit, but if they are not, the ones purchased should be the best in the market, as use about the water is very severe, and cheap articles soon go to pieces. If it is intended to run continously on batteries, a double set, of 6 or 8 each should be used. They should be placed in a double row in a box which has previously been thickly coated inside with asphalt um paint, to prevent the collection of moisture. As shown in Fig. 12 the zinc of one battery is connected to the carbon of the next, the two wires connected to the two end zincs coming out through holes in one end and those on the two carbons at the other end. The cover should be fastened on. The whole is now placed in one of the side lockers, where it will be dry. The spark coil is thickly covered with wax, or other water-proof material, as water very soon spoils it. This coil is placed in the locker along side of the battery box.

A double point switch is placed on the outside of the locker in a convenient position. There are two connections on the engine, one to the body of the engine, termed the ground connection, and one to the firing pin. The connections are as follows : - The two wires at one end of the battery box are brought together, and joined to a single wire, which is in turn carried to one of the connections on the engine. The two wires at the other end are connected, one to each outside point of the three point switch, and a single wire leads from the middle point to one terminal of the coil. A wire from the other terminal of the coil to the remaining connection on the engine completes the circuit.

It will be seen that when the switch is in connection with either point there is a continuous circuit formed through either set of batteries as desired, or it may be thrown off entirely when the engine is at rest. The joints in the wires should be carefully made, and might well be soldered. The circuit can be tested by closing the switch, loosening the wire from the firing pin and scratching it upon some of the bright parts, of the engine, a brilliant spark showing if all connections are comolete.

It is highly desirable that a magneto be used for continuous running, as batteries are inclined to become weak when used continuously. The magneto may be driven either by a friction pulley resting against the fly wheel, or by a belt on the flywheel, in which case it may, if desired, be placed in one of the side lockers, and the belt run through holes in the stairing. The wires from the magneto are connected so as to simply replace one of the sets of batteries already described, a single set only being used. By changing the double point switch the batteries may be used in starting and the magneto switched in after the engine is in motion.

When the engine is alined up the remaining bulk-head at the after end of the standing room can be fitted; it should be so arranged as to be easily removable, to get at the piping and tiller ropes. The floor may now be laid and fastened in place, It may be well to leave one board loose down the middle as there is a space 3" deep which may be used for small storage.

Before putting the boat into the water, the stern gland should be packed with suitable packing to prevent leakage around the shaft. Directions for starting the motor will usually come with each engine. It the amateur is not used to running this type of engine he should obtain assistance from someone familiar with gasoline engines and their operation. It is also advised that anyone unfamiliar with these engines get and study a copy of any of the recent works on gasoline engines and become familiar with the principles upon which they work.