30 



Dr. Henry's further Experiments on the 



ceeds, the only object of which is to carry into the flue of the 

 chimney any infectious effluvia that may possibly escape un- 

 decomposed. The thermometer is introduced occasionally 

 through a slit in the other half. The small air-cock //, which is 

 removable at pleasure, passes through an aperture in the same 

 half of the cover; and when open establishes a communica- 

 tion between the space DD and the atmosphere. The whole 

 vessel rests on a table EE (the legs of which are represented 



as if broken off), hollowed out to receive it. To this table the 

 vessel is fastened by four small bolts, the extremities of two 

 of which are shown by the sketch. To give a hold to the 

 heads of these bolts, Sijlanche is soldered near the bottom of 

 the outer vessel, which has also a corresponding^a«c//e at the 

 top, for the purpose of keeping the packing in its place. 



The small boiler G has a movable lid, from the centre of 

 which issues a pipe FF, five or six feet long, or any other 

 convenient length, which slips over the pipe that descends from 

 the steam-vessel. To bring the drawing into less space, this 

 pipe is represented with a part broken off. The dimensions of 

 every part of the apparatus are given by the scale, annexed to 

 the sketch. 



The vessel G is to be filled about two-thirds with water, 

 which, to save time, may be nearly boiling at the outset. 



Being 



