[1277] 
them, by which means the motion of the Engine muft 
be helpt in lifting up the oppofite bellows, that are to be 
openecl: and this oblervatioa may anfwer thegreateft 
difficulty that might be objected againft this contri- 
vance,- fo that I don't queftion, but this way for rail- 
ing water, may on feverall occafions be of a great ad- 
vantage. 
As a farther Explication oftheufe of this contrivance^ 
fee Tab. 3. Fig. 2. 
jiB JB.ktQ feveral Receptacles (et above one another^ 
which muft be well Ihutt and foddered every where. 
CDD. CDD. Are two flender Pipes, whereby the 
firft and third receptacles have a communication, with 
the Pump HH, 
EFF. EF F. Two other flender Pipes, whereby the 
fecond and fourth receptacles have a communication 
with the Pump //. 
HH. IL Two Pumps whofe plugs are fo moved by 
the jixts LL, that when one goeth down the other go- 
eth up, 
MM A wheel faftened to the ^x^> Z. that it may 
be moved by the Stream of a River. 
NO. F^NO. P^Are big Pipes for the water to^/ 
to go up, from a lower into a higher receptacle. 
0. §^0,^ Are Valves fitted to the top of the fore-- 
laid Pipes, that the water may not go down through 
the fame. 
Now it is plain that when the Plug in the Pump 
HH. is going up, the Jir comes in through the Pipes 
CDDy and fo it is rarified in the firft and third recep- 
tacles marked AAi and by that means thewater may ? 
be driven up into the faid receptacles through the Pipes ^ 
JV6>. becaule at the fame time the Plug in the Pump 
II going down, caufeth the Air to return to its ordi-^ 
nary preffure in the fecond and fourth receptacles, 
tfe^t it may be able to drive up the wgter through 
