Emerging Tubes j and it fliall circulate a hundred or 
more then athoufand times, according to the going 
of the Clock-work. If fomefuch account as this will 
unriddle the Engine, the contrivance of it is owing to 
a Theory communicated by my felf, &c. 
A Letter of Mr. R. A. relating to the famefubje6i. 
I have here given you a rude Draught of M?;^/r Papins 
curious Experiment, hoping thereby to have my con- 
ception of it more readily underftood 5 if it carry not' 
with it fome appearance of reafon, I delire you to 
fupprefsit, and you will much oblige, &c. 
I conceive, that the Air is forced into the outer glafs 
at the bottom thereof. 
That it then pafles up between the two Glaflcs. 
That the outer glafs or cafe being clofe luted at the 
Head or Crown to which the inner Glafs is hung by the 
Corall, the -^ir is forced into the mouth of the Inner 
Glafs. 
That the Air fo forced preffing on the furface of the 
Water that covers the Rock, forces the Water to rife 
thro thofe two extream parts that are not at all clog'd, 
or cover d with Water. 
Q^q q Ohjer. 
