Fifthly, The pipes leading from the opposite ends of the horizontalpart of the boiler, are designed to convey the water (which must be distilled) most remote from the direct action of the furnace, to replace that portion which may be carried to the upper part of the boiler by the great volume of steam gene rated between the two concentric cylinders.
Sixthly, To insure a length of stroke in high pressure engines, and that without increasing the diameter of the piston rods beyond that which is required to withstand the alternate tug and thrust; and without resorting to the very objectionable short stroke and piston rod of so large a diameter.
Seventhly, The slide valves, with their various modifications, requiring neither casings nor stuffing-boxes, the patentee claims as perfectly novel; the action of these being seen, admit of mathematicil adjustment, and enables the engineer instantly to reverse or stop the engine at pleasure.
Eighthly, For a modification of the crank and beam intended to supersede the use of a beam of the usual weight and dimensions, parallel motion, cross heads, and costly fittings and bearings connected therewith. This mode of con verting the reciprocating into the rotative motion, the patentee says, " accom plishes the grand desideratum of making one cylinder produce a more regular and equalized motion than can be accomplished by two cylinders when used to give motion to locomotive engines or paddle wheels." Ninthly, The condensation by which highly elastic steam of any temperature may be converted into water, without the application of injections, or by the extension of surface by making the cubic contents of the condensing chamber equal to the number of cubic inches of steam discharged.
The said condensing vessel to consist of one or more chambers, which may be made of light copper or other material. The sphere is preferred, as combining strength with great capacity. The conversion of steam into the liquid state is to be accomplished exclusively by expaneion, without regard to cooling surface. The patentee claims the making the condensing chamber of flexible substances, as varnished canvas, silk, cotton, or other suitable air and steam-light material, so as to allow of its alternate inflation and collapsing, every stroke of the engine ; and to avoid rupture (should the steam ever arrive at an elasticity exceeding the atmospheric pressure), it must be enclosed in a wove wire casing, to permit the atmospheric air to enter and escape with great funk, without checking the inflation, or collapsing of the aforesaid condensing cham ber. The more this condensing chamber exceeds the proportions given, the
more effectual will be its operation, as the steam will expand with less resistance than in a vessel of less capacity, as it more resembles the process of turning elastic steam into the atmosphere. form of the engine, as applied to locomotive carriages, will be explained by the following figures, and descriptive references accompanying them. Fig. 1 on the previous page, is an elevation showing the of the various parts. .Fig. 2 is a section of the boiler showing the flues, steam, cylinder, &c. 1'3g. 3 is a transverse seal= of of the boiler, furnace, and calorific regulator, showing its connexion with the blast regulator. Fig. 4 is a sectional plan of the lower part of the boiler, furnace, and flues. Fig. 5 is a longitudinal section of one of the slide valves with its seat. Fig. 6 is a plan of the seat, showing the steam and condensinges. The same letters of reference are used to denote the same parts in A is the boiler. in the lower part of which, and concentric with it, is placed the furnace B, secured to it by flanges, bolts, and nuts. The grate Cis supported upon an iron frame D, and is retained in its place by a wedge, or other simple fastening, and by releasing which, the grate may be withdrawn when required. The furnace is replenished with fuel through an aperture in the crown, by means of a pipe extending outside; the boiler terminates by two slides or doors, which are alter nately opened when fuel is admitted ; to prevent the discharge of the heated gases, a rake is added, working in a stuffing-box, to force the fuel into the fur nace should the pipe get choked. It is the intention of the patentee, however, to adopt a self-acting mode of feeding the furnace with filet, by means of fluted roller, or other axually efficient means, and which will receive their motion from the steam-engine. E E E E are four flue pipes connected to the top of the furnace, and descending below the bottom of the ash-pit, which prevents the natural flow of atmospheric air to supply the furnace.