rformirig divers Vroceffes. i c i 



the' remit." This procefsj excepting the bootBj has been 

 often tried, " in the way of philofophieal experiment," 

 upon mice and other i'mall animals; but, having never yet 

 been applied in "the large way," comes fairly within the 

 right of the patent. 



" Diftillation;" " efFe&uation of contact;" (< intromit- 

 fion into tabular or other cavities," (for inftance, filling a 

 thennomcter, as if inch a thing had never been performed in 

 the fame manner before Mr. B. hit upon the idea ;) " impreg- 

 nation;" " tranfminjon and percolation:" "mixture, viz. 

 of fluid mafTes with powder?, or heaps of fmall-fized bodies ;" 

 " regulation of heat;" ami " exficcation;" are ali enume- 

 rated and exemplified at great length, as procefles in which 

 the. exelufion of air would be an advantage : but we (hall 

 not abufe the patience of our readers by detailing the parti- 

 culars *. 



" The vacuum chamber may be of the fize of a large 

 room : — to enable the operator to fee the procefles, it may 

 have glafs windows to it, but the glafs nralt be thick." 

 Indeed it mult ! " to enable it to re lift the prefiiire of the at- 

 mofphere." " For the accomplifhment of fuch a. variety of 

 purpofes," fays Mr. B. "a variety of operations may n 

 tively require to be performed; to fome of which, a variety 

 a '-hincrv, and that more or lefs complicated,, may be 

 necefiary : as, in all or moft of thefe inftances, the four.ee of 

 motion will be expofed to the external atmofphere, while 

 the fubjecl: to be operated upon will be in the vacuum 

 chamber, the moft commodious means of tranfmittjng the 

 motion from the one of thefe fituations will, on this account, 

 be an object of attention." Our readers may furcly expect 

 fomething new in the way of invention after all tins pompo- 

 fity. We are now told that " the methods already in ufe in 

 the way of experiment, fuch as the collar of leathers, will in 



o with to be informed nr.iv niliv. may \\ c ;i c<nv of the 

 itign in The Repertory of Arts and Manufactures, v'uj. \ii. 



L 4 general 



