_Answer._ There is a round opening, _E_, called a _man-hole_, on top. Into this the end of a leather or canvas hose is introduced, which is attached to a stationary tank, at a water station, and a stream of water is then allowed to flow through the hose into the tank of the tender. QUESTION 348. _How is the water conducted from the tender to the engine?_ _Answer._ To each side of the front end of the tank, one end of a piece of rubber hose, _F F_, is attached, which is connected at the other end to the pipe on the engine which supplies the pump with water. The opening inside the tank through which the water flows to the hose is covered with a valve, which is not shown in the engraving, but which is operated by a lever or handle, _G_. The valve is covered with a hood or strainer, perforated with small holes, which is intended to prevent dirt from entering the hose and thus getting into and obstructing the pump. The hose is connected to the supply pipe by a screw-coupling similar to that used with ordinary fire-engine hose. QUESTION 349. _How are the flat sides of the tank strengthened so as to resist the pressure and weight of the water?_ _Answer._ They are sometimes braced or stayed with rods or bars, _a_, _a_, and _h_, _h_, fig. 205, extending from one side to the other and from the top to the bottom, and angle or ~⊤~ iron is also riveted to the sides to stiffen them. QUESTION 350. _How is the tender connected to the engine?_ _Answer._ By the draw-bar, _H_, and coupling-pin, _o_, fig. 205, and also by the safety chains, _d_. [Illustration: Fig. 204. Scale ¹⁄₄ inch = 1 foot.] [Illustration: Fig. 205. Scale ¹⁄₄ inch = 1 foot.] [Illustration: Fig. 206. Scale ¹⁄₄ inch = 1 foot.] QUESTION 351. _In what respect do the tender trucks differ from the engine truck?_ _Answer._ Chiefly in having the journal-bearings and frames outside of the wheels. [Illustration: Fig. 207. Scale ³⁄₁₆ in. = 1 inch.] [Illustration: Fig. 208. Scale ³⁄₁₆ in. = 1 inch.] QUESTION 352. _Why are the bearings placed outside instead of inside?_ _Answer._ Because they are then more accessible than if they are inside, and the oil-boxes on the axles can be entirely closed over the ends of the axles, so that no oil can leak out, whereas if the boxes are inside, they must be left open at both ends. When the boxes are on the outside, they can be oiled, or a journal-bearing can be removed and a new one put in its place, with much less difficulty than if the boxes were on the inside of the wheels. The only reason why the bearings of engine truck-axles are placed inside the wheels is because they would be in the way of the cylinders if they were outside. QUESTION 353. _How are the axle-boxes for the tender axle constructed?_ [Illustration: Fig. 209. Scale ³⁄₁₆ in. = 1 inch.]