. The Civil engineer and architect's journal, scientific and railway gazette. Architecture; Civil engineering; Science. Sir—As we have seen in your pages a plan of reversing engines, signed G. Coe, civil engineer, which is in principle similar to ours, of which we have been constructing a small sectional model for a locomo- tive engine, we take the liberty of sending you a small sketch of it, with the request, if you think it worth your attention, to give a place in your Journal. Figs. 1 and 2, show only those parts of a locomotive engine, which are wanted for the explanation of our new improv
. The Civil engineer and architect's journal, scientific and railway gazette. Architecture; Civil engineering; Science. Sir—As we have seen in your pages a plan of reversing engines, signed G. Coe, civil engineer, which is in principle similar to ours, of which we have been constructing a small sectional model for a locomo- tive engine, we take the liberty of sending you a small sketch of it, with the request, if you think it worth your attention, to give a place in your Journal. Figs. 1 and 2, show only those parts of a locomotive engine, which are wanted for the explanation of our new improve- ment. A is the steam-pipe which carries the steam into a cylinder B, fixed in the smoke-box. In the cylinder B, of about 8 inches inside diame- ter, move 2 pistons C and D, connected by a pipe E, which can be cast between the pistons, as the distance between C and D must be always the same. The piston rod is connected with the pistons by means of a boss fixed to D, by 3 stays, and is guided in the stuffing boxes G and H. On the top of the cylinder B, is the exhausting pipe F, on its sides are short pipes K K' and L L', which have a section of Sin. by liin., where they enter the cylinder, and a round section on the other end. The steam cylinders M M', have instead of valve boxes, cylinders N and N', with pistons 1 and 2, similar to those in the cylinder B, and those cylinders N and N' are connected with B by means of the pipes K K' and L L. The pistons 1 and 2 will act exactly like a common valve in respect to shutting and opening the steam pas- sages 3 and 4 of the steam cylinders M M', as they are moved by a common eccentric, (keyed to the crank shaft) by means of the levers R S and Q F. As we have given now all the explanation of the different parts shown in the sketch, we will next explain how we start, reverse, and stop the engine, without disengaging the spindles of the pistons 1 and 2, from their eccentric rings. Suppose the engine is to start in the direction shown
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