BoOOkR VII. Mechanic Pomerp. 125acceſſible, as if the Farth were to be transferred from a Mound,or Bill, to the next adjoining Fields, and there were a largedeep Vote, or Diich, between them, you could ſcarcely ob-tain your deſire any other Way.

Engin. VII.

Zo draw Mater, or Mineral matters, out f deep Melle,or Pita.

Fig. for. G Agricola deſcribes ſive divers Engins, in-＋vented and uſed to this end, in his Cth bookof Minerals ; the firſt 3 whereof are wrought by men, theother two are turn'd about by horſes, in all of them he uſcs2 double Bucket, or Basket, one of which being empty de-ſcends, while the other being full is raifed up; in theſe Engins,if the pits be deep there is this inconveniency, that when thedouble rope is of ſuch length, as the depth of the Well, it is,neceſſary that it be turn'd about every where on the Axis ofthe wheel, and it will take up much ſpace on the Axis, andrequire the Axis to be the longer; and by how much thickerthe rope is, the Axis requires to be the ſmaller; whence itwill happen, if the Well be not broader than the whole ſpaceof the Axis, on which the rope winds about, the Buckets, orBaskets, will hit againſt the ſides of the Well, and retard. the.motion; but if you make the Axis thicker, there will be fewer circumvolutions of the rope, and it will occupy a- leſſerpart of the Axis, but then it will require a greater force. ofthe power to raiſe the weight, or wheels much greater, to.which the immediate power is applied; moreover, that whichmakes to the preſent thing, and is of greater moment, is,hat the motion whereby the weights aſcend, is for the moſt.hart very ſlow; wherefore We will deſcribe this Engin; bywhofe help the weight is raiſed with a. motion doubly ſwifter.than the motion of the power. For let there be a. odenCylinder A B, erected perpendicularly, turning eaſily on its.N poles,