(484) 
Pump. For a fuller Defcription, I refer to the Au- 
thor, the Figure being neceflary for a clear under- 
ftandiog thereof; as likewife of a fccond Machine, 
contrived for the fame purpofe, and there dcfcrib- 
. ed, with its Figure. 
The^whole Treatife concludes an Harangue, which 
the Author made when he was admitted Profeflbr of A&. 
thmatkks at Marhrgk 
I O N D O N: 
Printed ior Sm. Smithy and Binj. Wallf^i^ Printers to the 
Royal Society^ at the Priftces A^p iQ S;« IMi Churdi: 
Yard. i697» 
