Grace's guide points to
"BRITISH LOCOMOTIVES" by C J Bowen-Cooke:
Messrs. Burstall & Hill, of
London, constructed a steam-coach (Fig 8 with annotations), which was made the subject of various experimental trials. The greatest speed attained was from three to four miles an hour, and there were repeated failures through defects in the boiler. The general arrangement of the machinery of this engine was the same as that of the “Perseverance,” which was entered by Mr. Burstall for the Rainhill contest in 1829. The following descriptions appears in an old number of the Edinburgh Journal of Science - “A represents the boiler, which is formed of a stout cast-iron or other suitable metal flue, enclosed in a wrought-iron or copper case, as seen in section, where A is the place for fuel, and a a a are parts of the flue, the top being formed into a number of shallow trays or receptacles for containing a small quantity of water in a state of being converted into steam, which is admitted from the reservoir by a small pipe. B is the chimney, arising from the centre flue; at D are the two cylinders, one behind the other, which are fitted up with pistons and valves, or cocks, in the usual way for the alternate, action of steam above and below the pistons.
“The boiler being suspended on springs, the steam is conveyed from it to the engines through the helical pipe c -, which has that form given to it to allow the vibration of the boiler without injury to the steam joints. E is the cistern containing water for one stage, say fifty to eighty gallons, and is made of strong copper, and air-tight, to sustain a pressure of about 60 pounds to the square inch. At e is one or more air-pumps, which are worked by the beams (F F) of the engines, and are used to force air into the water vessel, that its pressure may drive out, by a convenient pipe, the water into the boiler at such times and in such quantities as may be wanted. The two beams are con-nected at one end by the piston-rods, and at the other with rocking standards (H H). At about quarter of the length of the beams from the piston-rods are the two connecting-rods, g g their lower ends being attached to two cranks formed at angles 90 degrees from each other on the hind axle, giving, by the action of the steam, a continued rotary motion to the wheels, without the necessity of a fly-wheel. The four coach-wheels are attached to the axles nearly as in common coaches, except that there is a ratchet-wheel formed upon the back part of the nave with a box wedged into the axle containing a dog or pall, with a spring on the back of it, for the purpose of causing the wheels to be impelled when the axle revolves, and at the same time allowing the outer wheel, when the carriage describes a curve, to travel faster than the inner one, and still be ready to receive the impulse of the engine as soon as it comes to a straight course.
“The patentees have another method of performing the same operation, with the further advantage of backing the coach when the engines arc backed. In this plan the naves are cast with a recess in the middle, in which is a double bevel clutch, the inside of the nave being formed to correspond. The clutches are simultaneously acted upon by connecting levers and springs, which, according as they are forced to the right or left, will enable the carriage to be moved forward or backward.
“To the fore naves arc fixed two cylindrical metal rings, round which are two friction bends, to be tightened by a lever convenient for the foot of the conductor, and which will readily retard or stop the coach when descending hills. K is the seat of the conductor, with the steering-wheel (L) in the front, which is fastened on the small upright shaft (I), and turns the two bevel pinions (2) and the shaft (3), with its small pinion (4) which, working into a rack on the segment of a circle on the fore carriage, gives full power to place the two axles at any angle necessary for causing the carriage to turn on the road, the centre of motion being the perch-pin (I).
“The fore and hind carriage are connected together by a perch, which is bolted fast at one end by the fork, and at the other end is screwed by two collars, which permit the fore and hind wheels to adapt themselves to the curve of the road.
“To ascend steep parts of the road, and particularly when the carriage is used on railways, or to drag another behind it, greater friction will be required on the road than the two hind wheels will give, and there is therefore a contrivance to turn all the four wheels. This is done by a pair of mitre wheels (4) one being on the hind axle, and the other on the longitudinal shaft (6), on which shaft is a universal joint, directly on the perch-pin (I) at (7). This enables the small shaft (7) to be turned, though the carriage should be on the lock. At one end of the shaft (7) is one of a pair of bevel wheels, the other being on the fore axles, which wheels are in the same proportion to one another as the fore and hind wheels of the carnage are, and this causes their circumference to move on the ground at the same speed.
“The patentees, by a peculiar construction of boiler, intend to make it a store of caloric; they propose to heat it from 250 to 500 or 800 degrees Fahrenheit, and by keeping the water in a separate vessel, and only applying it to the boiler when steam is wanted, they hope to accomplish that great desideratum in the application of steam to common roads, of making just such a quantity of steam as is wanted, so that when going down-hill, where the gravitating force will be enough to impel the carriage all the steam and heat may be saved, to be accumulating and given out again at the first hill or bad piece of road, when, more being wanted, more will be expended.
“The engines are what are called high-pressure, and capable of working to ten-horse power, and the steam is purposed to be let off into an intermediate vessel, that the sound emitted may be regulated by one or more cocks.”
If they were Scottish Engineers based in London, surely they would have visited Birmingham more than once...