368 MARINE STKAM-ENGINKS. 



the cover, to supply the vessel with water, and the plug to keep 

 in the steam ; I, four wheels, on which the whole is moved, each 

 wheel revolving in a recess cast in the bottom of the outer case, 

 as represented by dotted lines in Figs. 3 and 4 ; m, four handles ; 

 n, the flanches of the fire doorway and of the flue, represented in 

 Fig. 4 by dotted lines. A pipe to communicate with a chimney 

 while the water is being heated must be made to suit locality, 

 and therefore cannot require any description. This apparatus 

 can be heated in a vestry room, and the fire-door and flue closed 

 and then wheeled into the church, where it will soon diffuse a 

 most comfortable warmth ; or the heat may be kept up while 

 standing in its place by having a constant communication with 

 a chimney, and thus diffuse a much more salubrious heat than 

 can be obtained by metallic or earthen stoves heated immediately 

 by the fire." 



It is doubtful if the profits he received from the 

 heating apparatus covered the cost of the patent. The 

 first stove was not unlike his first locomotive boiler. 

 The more highly-finished stove resembled the marine 

 tubular boiler, also of former years, in the further 

 application of which we now follow him. 



" MR. GILBERT, " HAYLE, January 2th, 1829. 



"Sir, Since I have been down I have made a small 

 portable engine, and set it to work on board a coal-ship for 

 discharging the cargo ; it is very manageable, and discharges 

 100 tons with 1 bushel of coal, without any person to attend it, 

 there being a string that the man in the hold draws when the 

 coal-basket is hooked, which is again drawn by the man who 

 lands the basket on the deck ; the string turns and re-turns 

 the engine. It is near a ton weight, but as I find it double 

 the power required, I am now making a smaller one, 3J feet 

 high and 3J feet diameter, about 12 cwt. 



" I intend this engine to warp the ship, pump it, cook the 

 victuals, take in and out the cargo, and do all the hard work. 

 The captains are very anxious to get them on board every ship. 

 I think that an engine of 39 cwt. would propel their ships four 



