MACHINE FOR SWEBPING CHIMNIES. 247 



wiih js, if poffible, to keep alive the fpark that has been kindled 

 by a truly philanthropic individual, with a view to reftore a 

 degraded clafs of our fpecies to their rank in civil fociety. The 

 machine, as it is conftrufted folely for the purpofe mentioned 

 above, is certainly novel in its intention, and without a better 

 acquaintance with its principle and operation than the public 

 are at prefent in polTeffion of, it is not likely to gain that notice 

 which in my judgment it is entitled to. There is a propenfity Propenfity to 

 in us to turn into ridicule any thing that will admit of a ridi- jions, 

 culous conftru6lion, or afford an opportunity for the difplay of 

 our wit; and fuch is the unfortunate circumftance of this ma- 

 chine, that grinning takes precedence of gravity the moment 

 it is announced as a candidate for the gold medal at the Adel- 

 phi. However, happy for it, and thrice happy for me, there, 

 is a tribunal which can judge fairly and fcientifically of its 

 merits, for which I prefent it as follows. 



The body of t^e machine A, Plate XIII. is made of copper, Defcriptionof 

 of about Sib. to the fquare foot, and its contents are abou^t ^^^^^^P^"[^J^ 

 three cylindrical feet. In the middle of the cover, which is which air is 



foldered on, is a fyrintje or condenfer, having its handle as '^°"'^5"^^'^» '^PT^* 

 ,, ^ r ^ r I - - r , municates with 



appears above the cover. On one tide or the cover is mierted a tube charged 



a crooked pipe, having a valve opening inward in its inner or ^"^'^ ^""^'f . 



lower. end; the ftem of which comes up through the pipe, and being blown up 



terminates with a button C. The pipe is continued by a flex- '^.^ chimney 



ible leather one, to which is united the tin plate tube B B.- foot^^ °^" 



This tube B B has a crofs bar of tin plate fixed edge-ways in 



the bottom or breech of the tube which detaches from the 



leather pipe fomewhat like a piftol barrel, leaving a piece of 



tube about fix inches remaining to the leather pipe, into the 



bottom of which this cafe bar is fixed, and ferves to receive a. 



charge of fmall gravel, having a piece of paper firft laid on the 



crofs bar ; the other part of the tube is then to be replaced, 



and the air-veffel fuppofed to be full ; the valve is preffed down 



by a little lever accompanying the machine, and its contents 



are difcharged into the (haft of the chimney; and if there is 



any foot worth fweeping away, it will come down. 



Obfervations concerning the Machine. 



I do not pretend to have made any new difcovery in the This operation 

 conftrudion or application of the machine, for it is well known jf fin^i^ar to 

 that a mulket has often been applied for the fame purpofe^ and up the'cSamey* 



with 



