_Three Wrenches for Coupling-joints._--These are for tightening the coupling-joints, when that cannot be sufficiently done by hand. When the hose are all put together a man is sent along the whole line with a pair of wrenches to tighten such of the coupling-joints as require it. The wrenches are generally made with a hole to fit the knob on the coupling-joint, and, when used, are placed, one on the nob of the male and another on the nob of the female-screw, so as to pull them in opposite directions. _Two Branch Pipes._--These are taper copper tubes, having a female-screw at one end to fit the coupling-joints of the hose, and a male-screw at the other to receive the jet pipes, one is 4 feet long to use from the outside of a house on fire, the other 12 inches for inside work. _Three Jet-pipes_ or nozzles of various sizes made to screw on the end of the branch pipe. A great many different shapes of jet have been tried, and that shown in Fig. 5, I found to answer best when tried with other forms. The old jet was a continuation in a straight line of the taper of the branch, from the size of the hose-screw, to the end of the jet-pipe; this had many inconveniences; the size of the jet could not be increased without making the jet-pipe nearly parallel. As the branches were sometimes 7 feet or 8 feet long, in some instances the orifice at the end of the jet-pipe was larger than that at the end of the branch. The present form of the jet completely obviates this difficulty, as the end of the branch is always 1-1/2 inches diameter. [Illustration: FIG. 5.] The curve of the nozzle of the present jet is determined by its own size; five times one-half of the difference between the jet to be made and the end of the branch, is set up on each side of the diameter of the upper end of the branch, a straight line is then drawn across, and an arc of a circle described on this line, from the extremity of each end of the diameter of the jet, until it meets the top of the branch; the jet is then continued parallel, the length of its own diameter; the metal is continued one-eighth of an inch above this, to allow of a hollow being turned out to protect the edge: The rule for determining the size of the jet for inside work is, to "make the diameter of the jet one-eighth of an inch for every inch in the diameter of the cylinder, for each 8 inches of stroke." The branch used in this case is the same size as shown in Fig. 5. When it is necessary to throw the water to a greater height, or distance, a jet one-seventh less in area is used, with a branch from 4 feet to 5 feet long. _Two Lengths of Scaling Ladders._--These are 6-1/2 feet long, and are fitted with sockets so that any number up to 7 or 8 may be joined together to form one ladder varying in length according to circumstances from 6-1/2 to upwards of 40 feet.