f&mb. 457. 
PHILOSOPHICAL 
TRANSACTIONS 
For the Months of April, May and June , 1735-. 
The CONTENTS. 
I. An Account of an Inftrument or Machine for 
changing the Air of the Room of JickfFeople 
in a little Time , by either drawing out the foul 
Air , or forcing infrefhAir j or doing both fuc- 
cejjively , without opening Doors or Windows. 
<By the Rev* J.T. Defaguliers, LL. D. F/R-S. 
II. A Calculation of the Velocity of the Air moved 
by the new- invented Centrifugal Bellows of 
7 Feet in Diameter , and 1 Foot thick, within , 
which a Man can keep in Motion with Very little 
Labour , at the ate of two (Revolutions in one 
Second. !By the fame. 
II I . Tie'll fes of the foregoing Machine. Communicated 
in a Letter to Cromwell Mortimer, M. D. 
(R.S. Seer. Feb. 2 3 , 171,6. from the fame. 
IV. The Cafe of a Cataleptick Woman. Com - 
municated to the Royal Society by Richard 
Reynell, Apothecary , London,, 
a V. Some 
