supplement. AGRICULTURE AS PRACTISED IN BRITAIN. 



1 ; ;<;.-! 



boiler ; at the extremity of which it goes off. right and left, through two lateral flues, which join at h, 

 ami go' into the stack or chimney : i is the feed head, supplied either from any sufficiently elevated source, 

 or by a pump ; it is adjusted to supply the boiler at a pressure of \\ lb. to the square inch : It is the 



"safety valve, loaded to the same pressure ; the steam from it blows 

 into the flue; I is the man-lid; m. a whistle, for the purpose 

 of giving notice when there is a deficiency of water in the boil- 

 er, should such ever take place ; boilers upon this construction 

 being much more liable to injury in this respect than those 

 which have no internal flues ; n is the steam-pipe and stop-valve, 

 which is connected with the steaming vessels. Fig. 11K9. is a 

 cross section of the boiler : the same letters refer to both figures. 

 The top part of the boiler, above the masonry, is covered with a 

 wooden jacket, one inch thick, and supported by segments of 

 angle iron, at an interval of one inch and a quarter from its ex- 

 ternal surface; and for the same reason the walls of its setting 

 are all built hollow. Fig. 1190. is a side elevation of the steam- 

 ing vessel for cooking potatoes, carrots, parsneps, turnips, &c, or 

 other such things: of which fig.\\9\. is across section, through 

 the centre of its length : the same letters refer to both, a is the 

 external cylinder or outer case of the vessel, formed of oaken 

 staves one inch and a half thick, hooped together, and having 

 a close end, staved in at the end b. The other end is closed by 

 a moveable lid (c) of wood, fastened by cotters driven through 



two links formed 

 bees' wax and tallow 



in projections from the adjacent hoop, and made steam-tight by a gasket, soaked in 

 low • it is capable of being very readily put on or taken off. In the lower segment of 



the cylinder, an arched wood- 



1190 



en false bottom, d, is placed, 

 stiffened by slight cross ribs 

 of cast iron, and perforated 

 full of holes live eighths of an 

 inch in diameter ; above, and 

 supported by this, the mat- 

 ters to be cooked are placed 

 until thev quite fill the cylin- 

 der. The* whole thing is hung 

 upon two gudgeons or jour- 

 nals, e e, passing through the 

 centre of gravity of tiie cylin- 

 der, when loaded ; so that, by 

 the arrangement about to be 

 described, either end of it 

 may be elevated or depressed. 

 One of these journals is hoi. 

 low, and immediately connec- 

 ted with the steam-pipe from 

 the boiler by a stuffing-box, 

 /; so that the steam enters 

 the bottom of the cylinder 

 through this journal and the 

 curved pipe g, the former 

 having still free liberty of mo- 

 tion. Both journals move in 

 brasses, resting on strong dia- 

 gonal framing, h h, bolted 

 down to a mass of masonry. 

 i i are two wrought-iron 

 links, connected by joints with 

 the hoops of the cylinder at 

 top, and with the extremities 

 of the equibrachial lever £ ; 

 the centre of winch consists 

 of a Y shaft, /, supported by 

 two or three slight frames, 

 vi m m, and having the long 

 vertical lever n keyed on it 

 at one end. These frames are 

 bolted to proper timbers in the 



it is equal in pressure to the density of the steam in the cylinder, ^greatest part l conmrt „, 



freely in a square aperture, below the level of the floors in figs. 1189 and 1 » -- \" ere l ^ tube « ul 



with a small sewer to take away the water. It is evident that when the cyhnder , , noved the tube 



rise and fall vertically in the hole or upright trunk in the »r J. J^Xdcoi he c 1 nder is 



steaming vessel. The steam being up in the boiler, and the lid c removed, the end c o « ^ > 



elevated to an angle of about 40° when it comes just «n°er ajargejv^ooden Bhoot^opper ut ^ 



loft above, close to which is placed a slici 



large roots requiring to be steamed ; from 



until it is full. Potatoes are either shot d 



hopper, or from sacks from men's shoulders, ... 



cottered tight, the cylinder again placed horizontally, and the steam ad. »""1. conyenien , rece ptacle. 



complete, a low capacious truck, or a large square basket on wheels, or an) other conyeniencreoepu lib, 



is brought under the end 



vegetable matter to fall o 



false bottom is now to be 



the former is only necessary when potatoes 



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