C 5^ ] 



whom (as tlic expencc can be no object to men of 

 their fortune) many members may be found, ready 

 to try it in their firfl: freight of corn. 



Should it fortunately obtain the approbation of 

 the fociety, its author will be exceedingly gratified ; 

 if found imperfect, they are welcome to lay it open 

 for ingenuity to improve on. I have fufficient me- 

 chanical knowledge myfelf to increafe its pov/er 

 7na7iy, many tons in a minute; but the complication 

 of machinery can be no recommendation in engines 

 confl:ru(51:ed for naval purpofes. 



Defiring you, together with this paper, to prefent^ 

 my bed refpeifts to the meeting; 



I remain. Sir, 



your humble fervant, 



To Mr. Mattheivs. THOMAS SOUTH. 



The Plan of the Ventilator defcribedy with References 



to the Plate. 



Fig. i.TS a cylindrical air-veffel or forcing pump of 

 -*- lead, tin, or other cheap metal, its internal 

 diameter being ten inches, and its length three feet, 

 having a crutch-handled pifton to work with, and 

 an iron nofle, viz. a hollow-inverted cone, two feet 

 long, to condenfe the air, and increafe its power ia 

 its palTage downwards. 



This 



