VOL. XXXIX.] PHILOSOPHICAL TRANSACTIONS. 15 



out of the blower, proceeding from the centrifugal force, and the circular velo- 

 city of the outer circle, which is the real velocity of the stream of air out of 

 the blower of this machine, viz. 68.53 feet per second, which is at the rate of 

 a mile in about 77 seconds, or about 7 miles in Q minutes. 



The Uses of the foregoing Machine. By the same. N° 437, P- 47. 



Besides the uses of this machine for sick rooms, for prisons, or large assem- 

 blies, for warming, cooling, or perfuming any chambers at a distance, it may 

 also serve in a man of war, to takeaway the foul air between decks, occasioned 

 by the number of men in the ship, and to give them fresh air in a few minutes. 

 In every part of the vessel, every foul hole may be rendered wholesome, and 

 even the stench and foul air from the surface of the bulge water may be carried 

 oft". Also for mines the machine must prove of excellent use; for as the 

 damps, either fulminating, which taking fire, destroy the men and ruin the 

 works, or arsenical, which kill by their poisonous nature, are some specifically 

 lighter, and some specifically heavier than common air, this centrifugal wheel 

 can in a little time drive down air through wooden trunks, or launders, of 7 

 inches bore, in such quantities into the deepest mines, as to cause all the light 

 damp to come out at the top of the pit; or, by only altering two sliders, suck 

 away all the heavy poisonous damp, while wholesome air goes down from above 

 ground into the pit, so as to fill all the subterraneous caverns with fresh and 

 wholesome air. 



Likewise a great many of the difiiculties which attend the carrying on sub- 

 terraneous passages, for the conveyance of water from mines, called soughs, 

 adits, or drifts, may be removed by the help of this wheel ; for the fresh air 

 may be driven in a very little time to the place where the men are at work, 

 though at the distance of 2, 3, or 4 miles, and therefore also to any interme- 

 diate space; whereas the practice now is, either to make a double drift, with 

 communications between the two for the circulation of the air, or to sink per- 

 pendicular shafts or pits, from the top of the hill over the adit: both which 

 methods are very expensive, and inferior to the application of this machine. 



The Case of a Cataleptic Woman. By Richard Reynell, Jpolhecary, London. 



N" 437, p. 49. 



Ann Billiard, a servant, about 21 years of age, had been for some time irre- 

 gular in her menses, and very much afflicted for the loss of a friend. July 

 10, 1730, she complained of a pain in her head, sickness in her stomach, with 

 a general disorder ; and took Gascoign's powder for a sweat; next morning. 



