at Hawthorn Grove, Dorchester. 205 



The furnace (w), is three feet high and three deep, and about 

 two and a half in width. The furnace door is twelve wide and 

 thirteen high, and the ash door twelve wide and seven high. The 

 flue (n n), which is represented in part by the dotted lines, runs 

 from the furnace across, underneath the walk, to the pit, and form- 

 ing one end of that, is carried along, making one side of the walk 

 and the front of the pit, to the other end of the conservatory, and 

 again running across, underneath the walk, is carried into the chim- 

 ney (o), in the back wall. The flue is built twelve inches high 

 inside, and eight inches in width, and is covered with twelve inch 

 tile ; at the corner of the pit, and at the opposite corner of the 

 conservatory, are openings to the flue, fitted with soapstone doors, 

 for the purpose of cleaning it out when foul. The boiler is set in 

 the furnace, and will contain sixteen gallons ; the pipes (j? p) are 

 four inches in diameter, and run, as represented by the dotted lines, 

 to the corner of the stove ; from thence across the front to the 

 reservoir (§'), at the corner of the conservatory. The reservoir is 

 six feet long, fourteen inches high and thirteen wide ; the pipes 

 run through it, and are fitted with a stop-cock, so that the heat can 

 be raised before all the water is warmed in the reservoir. To be 

 sure of a sufficient command of heat in the stove, a steam appara- 

 tus is combined with the hot water system. A steam pipe, about 

 an inch in diameter, is fitted into the boiler, and from thence runs 

 round the bottom of the pit, as seen by dotted lines, heating a 

 bed of stones, which warms the soil above, and the condensed 

 water runs into the ciss-pool. This, Mr. Wilder states, he has found 

 very useful, in severe cold weather, in keeping up an equal tem- 

 perature in the soil. Some further remarks on the construction of 

 the steam apparatus, together with a plan, will be made before 

 closing this article. 



The length of the lower roof-sashes is twelve feet ; that of the 

 upper ones, seven feet ; and the height of the front ones two feet ; 

 the width of each, three feet two inches. They are all glazed 

 with four rows of six-by-eight glass, with laps from a quarter to a 

 half an inch. The under side of the sash rails are rounded off 

 instead of being bevelled, as is usually done ; which has a lighter 

 appearance. The work, generally, is made vi'ith a regard to as 

 much light as possible. 



Having thus given the dimensions as accurately as our minutes 

 will allow, some remarks upon the management of the steam ap- 

 paratus remain to be noticed. The object of the steam pipe has 

 been before stated ; it cannot be used, however, at the same time 

 that the hot water circulates from the boiler. To obviate this, 

 stop-cocks are' fitted into the hot water pipes about a foot from the 

 boiler ; more fire is then added to produce steam, which is carried 

 off by the pipe, heating in its course the stones, &£c., in the pit. 

 The hot water pipes just inside of the conservatory, where they 



