Figure 3 is a plan of the pump connections. The reference letters indicate pipes as follows: A A, cold supply from house tank; B B, supply mains to fire tank; D D, etc., fire lines; H, C, and I are respectively hot, cold, and circulation pipes to the different sets of fixtures, etc., G is the steam connection to the tank coil, S S are pump suctions, L is a supply to the receiving tank, K K are drip pipes for emptying rising lines, and M is the main 6-mch supply under city pressure.

Figure 4 is a view of the fire pump. Letters B, D, M, and S have the same significance as in Fig. 3. H is the 6-inch Thomson meter, N is a hose cock, Q is the steam supply, P the exhaust and Q the automatic regulator.

Figure 5 is a view of the connection of house pump G, Fig. 1. City water from pipe L is ordinarily delivered through two 2 inch ball cocks to tank F, whence it is delivered by the 3-inch suction S to the pump and forced to the house tank, about 85 feet above, through the 2½ - inch pipe B. Water may however be drawn directly from the city mains by opening the valve U, which is usually closed, and by closing the valves a b and opening c d it can be pumped directly to the fire lines and fire tank through pipe E. C C C are cold-water supplies to fixtures on the lower floor, and O is a 1½ - inch boiler feed pipe. M is a 4-inch overflow and N is a 1¼ - inch emptying pipe for the receiving tank. K is an emptying pipe for the fire-tank force main. Steam is supplied to the pump through pipe R and is exhausted through T; a 1-inch pressure pipe P connects with the house tank and has a ½ inch branch to the automatic governor D, which shuts off steam when the water in the tank reaches a level near its top, and admits it and starts the pump when the level falls a few inches.

Figure 6 shows the connections of the hot-water tank J, Fig. 1, which is supplied from the roof tank through 1½ - inch branch C of pipe A, and delivers hot water under tank pressure through the 1¼ - inch pipes H and I, which supply groups of fixtures in the north and south parts of the building respectively. The return circulation is brought to main F, and enters the tank through branch P, which also serves to empty it to the sewer through pipe Q, when valves K K are closed and valve G is opened. N is a safety valve and pipes B B, D D, and E are supplies to the fire tank and fire lines from the pumps, as in Figs. 1, 4, and 5.

Figure 7 is an elevation and Fig. 8 is a vertical center section of the steam-pump governor D, Fig. 5, which controls the operation of the house pump to correspond with the level of water in the tank. In Fig. 8 the valve is shown open so that steam is admitted at A, passes through seats C C of the double balanced valve D, and enters the steam chest of the pump through the inlet B. The valve D is supported by stem E, which is connected to the rod H by the adjustable sleeve yoke F. The rods E and H work through glands, and the latter terminates in a piston head I which works in cylinder J under tank pressure from pipe K. As soon as the operation of the pump has filled the tank to a fixed level the increased pressure on piston I overcomes the resistance of spring G, and depresses and closes valve D, thus stopping the pump. Drawing off a small quantity of the water in the tank diminishes the pressure in cylinder J so that spring G raises and opens valve D, and so on. L is a lock nut and adjustment for lengthening or shortening rod E in sleeve F, so as to set the spring G at any required tension. A similar governor (Q, Fig. 4) is attached to the fire pump, so arranged as to be balanced by a constant pressure of 100 pounds, maintained in the stand-pipes, and to turn on steam the moment that pressure falls.

PLUMBING IN THE FIFTH AVENUE THEATER, NEW YORK.

Figure 9 shows the gas distributer B, Fig. 1. A 4-inch gas supply P is connected to a 10 inch drum O, from which the supplies B, C, D, E, F, and G are taken for different groups of stage and auditorium lights, which can be quickly adjusted by the key valves P P, etc., which, however, cannot totally extinguish them even when entirely closed, because a ¼ - inch by pass pipe H is always open and admits enough gas to preserve the flame at all times. These by-passes are all supplied from branch Q, taken from the pipe N to the stage chandelier. Pipe A supplies the orchestra, gallery, and balcony burners; pipe S is to the ground lights on each side of the stage; pipe E is to the footlights, F is to border lights, and I, J, K, L. and M are for the rigging loft. The dressing-rooms, corridors, foyers, halls, toilet-rooms, entrance, and all stairways, etc. have a separate meter and independent 3-inch supply. All the piping was put together without the use of red lead, and the use of gasfitters' cement was absolutely prohibited. After the piping was completed it was tested to successfully maintain for one hour an air pressure of 15 inches of mercury.

No pipe is less than ⅜-inch bore, and this size is used only for one or two bracket lights. No pipe for chandeliers is less than ½ - inch bore up to four burn-ners, or three-fourths of an inch for chandeliers with from four burners up to 15. Gas pipes were proportioned according to the following table of sizes, etc.: