348

Steam Fire-Engine.

[Book III.

“ E, a cylindrical box attached to the top of the steam chamber, contain-ing a conical steam valve e, and also safety valve e'. e" screw withhandle connected to the steam valve, for admitting or shutting off the steam.e'" induction pipe, for conveying the steam to

F. the steam cylinder, provided with steam passages and slide valve ofthe usual construction, and secured to the carriage frame in the same man-ner as the force pump. yEduction pipe, for carryingoff the steam into theatmosphere. f Piston, provided with metallic packing, on Barton’splan, f", Piston rod of Steel, attached to the piston rod of the forcepump by means of

G. a crosshead of wrought iron, into which both piston rods are insertedand secured by keys. g, Tappet rod attached to the crosshead, for mov-ing the slide valve of the steam cylinder by means of nuts g', g 1 , whichmay be placed at any position on the tappet rod.

H. Spindle of wrought iron, working in two bearings attached to thecover of the steam cylinder, the one end thereof having fixed to it, Aa lever, moved or Struck ultimately by the nuts g', g'. h' a lever, fixed tothe middle part of the spindle H, for moving the steam valve rod.

I. Force pump for supplying the boiler, constructed with spindlevalves on the ordinary plan ; the suction pipe thereof to communicatewith the valve chamber of the water cylinder, and the delivering pipe tobe connected to the horizontal part of the boiler. i, Plunger of force pump,to be made of gun metal or copper, and attached to the crosshead G.

J. Blowing apparatus, consisting of a square wooden box, with pan-eled sides, in which is made to work a square piston j, made of wood,joined to the sides of said box by leather. j', Circular holes or openingsthrough the sides, for admitting atmospheric air into the box; these holesbeing covered on the inside by pieces of leather or India rubber cloth toact as valves. j", are similar holes through the top of the box, for passingoff the air at each stroke of the piston, into

K. Receiver or regulator, which has a movable top k, made of wood,joined by leather to the upper part of the box ; a thin sheet of lead to beattached thereto, for keeping up a certain compression of air in the regu-lator. k ', Box or passage made of sheet iron, attached to the blowingapparatus, and having an open communication with the regulator at k ":to this passage is connected a conducting pipe, as marked by dotted linesin No. 156, for conveying the air from the receiver into the ash pan, underthe furnace of the boiler at k'" ; this conducting pipe passes along the in-side of the carriage frame on either side.

L. L. Two parallel iron rods, to which the piston of the blowing 'ap-paratus is attached : these rods work through guide brasses l, l, and theymay be attached to the crosshead G, by keys at V , V. The holes at theends of the crosshead for admitting these rods are sufficiently large to al-low a free movement whenever it is desirable to work the blowing appa-ratus independently of the engine.

M. Spindle of w r rought iron, placed transversely, and working in twobearings fixed under the carriage frame : to this spindle are fixed twocrank levers m, m, which by means of two connecting rods m! m 1 , givemotion to the piston rods L, L, by inserting the hooks m", m" , into theeyes at the ends of the said piston rods.

N. Crank lever, fixed at the end of spindle M, which by means of

O. Crank pin, fixed in the carriage wheel, and also

P. Connecting rod, will communicate motion to the blowing appara-tus, whenever the carriage is in motion, and the above parts duly con-nected.