F is the carriage-frame; E, one end of a long horizontal cylinder, forming the principal part of the boiler, which extends to the large vertical vessel A, at the other end of the carriage, and contains forty-five gallons of water; L, a hopper to supply the fuel, (which is carried in small baskets placed on the carriage,) whence it is conducted by a tube in the centre of the steam-chamber A, into the furnace S, beneath. At C is a blowing machine, the air from which is conducted by a pipe under the carriage, and proceeding by the tube K enters the ash-pit M, under the furnace; Q is a pipe for the escape of the heated gases after the combustion, and forms the only chimney used; B is the water-tank; at D N are two working cylinders with their steam-pipes and valves; the cylinders are six inches in diameter, and have a twelve inch stroke; O G are connecting-rods, which impart the force of the engines to the running-wheels. The axletrees are fixed to an iron rod, and slings are introduced to prevent the side action between the rod and the carriage-frame; and to prevent the effect of the springs from counteracting the action of the engine, the connecting-rods are placed as nearly as possible in a horizontal position, and the motion is communicated to them by bell-cranks on each side of the carriage, being connected by the slings to the piston-rods. The pistons used are the patent metallic of Barton; and the running-wheels, the patent suspension kind of Theodore Jones and Co.
The figure below exhibits a section of the boiler introduced by Messrs. Braithwaite and Erricson, into the Novelty steam-carriage. S is the furnace, surrounded by water; and L the tube by which the fuel is supplied to feed the fire; M is the ash-pit, through which the air is forced by the pipe K from the bellows of the engine. The vessel containing the water that surrounds the furnace, and the long cylinder that proceeds horizontally from it, constitute the boiler, as shown at E E e. The flames and heated air from the furnace,"after ascending by the action of the bellows, enter a long tortuous flue, which makes three turns in the entire length of the horizontal boiler, escaping finally at the chimney. The fuel in the furnace has, therefore, a direct action upon the water surrounding it; and the water in the long cylinder is operated upon by the gases in the flue, which gradually tapers from the furnace to the chimney, and has a constant inclination downward; and as the whole of the furnace and flue is surrounded by the water of the boiler, there can evidently be very little of the heat misapplied.
The Sans Pareil of Mr. Hackworth is represented in elevation in the subjoined cut. The boiler B is cylindrical, of the Trevithick kind, with one of its ends convex outwards, and the other flat. The fire-bars were of greater extent than usual, having an area of ten feet; and the flue-tube is returned to the front on one side of the fire-place, where it enters the chimney C. D represents one of the two working-cylinders; these were seven inches in diameter, and had an eighteen-inch stroke. The piston rods, through the medium of the vertical connecting rods, operated upon the hind pair of wheels; and the latter being connected to the fore wheels by the horizontal connecting rods, shown acting in the manner of cranks, motion was communicated to both pairs of wheels, - an arrangement which is designed to cause a greater adhesion of the wheels to the rails, and of enabling the carriage to draw a greater load, than if only one pair of wheels was operated upon.
The Sans Pareil.