| Miles. | |
|---|---|
| Planet | 9,986 |
| Mercury | 11,040 |
| Jupiter | 11,618 |
| Saturn | 11,786 |
| Venus | 12,850 |
| Etna | 8,764 |
| Making in all | 66,044 |
In the half year ending 31st December, 1833, the six best engines performed as follows:—
| Miles. | |
|---|---|
| Jupiter | 16,572 |
| Saturn | 18,678 |
| Sun | 14,552 |
| Etna | 17,763 |
| Ajax | 11,678 |
| Firefly | 15,608 |
| Making in all | 95,851 |
(197.)
The external appearance of the engine and tender is shown in the engraving at the head of this chapter. In [fig. 97.] is exhibited a vertical section of the engine made by a plane carried through its length; and in [fig. 98.] is exhibited a corresponding section of its tender,—the tender being supposed to be joined on to the engine at the part where the connecting points appear to be broken in the drawing. In [fig. 99.] is exhibited the plan of the working machinery, including the cylinders, pistons, eccentrics, &c. which are under the boiler, by the operation of which the engine is driven. [Fig. 100.] represents the tender, also taken in plan.
In [fig. 101.] is represented an elevation of the hinder end of the engine next the fire-box; and in [fig. 102.] is represented a cross vertical section through the fire-box, and at right angles to the length of the engine, showing the interior of the boiler above and beside the fire-box, the rivets and bolts connecting the internal and external fire-boxes, the regulator, steam funnel, and steam dome.
In [fig. 103.] is represented an elevation of the front of the engine next the smoke-box, showing the cylinder covers W, buffers T, &c.; and in [fig. 104.] is represented a section of the interior of the smoke-box, made by a vertical plane at right angles to the engine, showing the tube plate forming the foremost end of the boiler, the branches S of the steam-pipe leading to the cylinders, the blast-pipe p, the cylinders H, and the chimney G.
The same letters of reference are placed at corresponding parts in the different figures.
The boiler, as has been explained in the engines already described, is a cylinder placed upon its side, the section of which is exhibited at A, [fig. 97.] The fire-box consists of two casings of metal, one within the other. The fire-grate is represented at D. The tubes by which the products of combustion are [Pg366] drawn from the fire-box to the smoke-box F are represented at E. Upon the smoke-box is erected the chimney G. In the engine from which this drawing has been taken, and which was used on the London and Birmingham Railway, the boiler is a cylinder 71⁄2 feet long, and 31⁄2 feet in diameter. It is formed of wrought-iron plates 5⁄16 of an inch in thickness, overlapping each other, and bound together by iron rivets 7⁄8 of an inch in diameter and 13⁄4 inch apart. One of these rivets, as it joins two plates, is represented in [fig. 95.] The boiler is clothed with a boarding of wood a, an inch in thickness, and bound round by iron hoops screwed together at the bottom. Wood being a slow conductor of heat, this covering has the effect of keeping the boiler warm, and checking the condensation of steam which would otherwise be produced by the rapid motion of the engine through the cold air.