re
like the Vaulting of a Stair-Case whose ascent goes turning. This being
done, this Vice was fastned and strengthned with Planks, which were
pitched within, and covered with Iron Rings and Plates without: At the
two ends of the piece of Wood, were Pins, which entring into the
Suckets, made the _Machine_ capable of Motion. This Vice or Skrew was
placed according to the bent or sloping of the Triangle Rectangle of
_Pythagoras_. This _Machine_ elevated easily a great quantity of Water,
but it could not carry it high.

[Sidenote: _Lib. 10. Chap. 2._]

The Fifth _Machine_, was the Pump of _Ctesibius_; it was composed of two
Bodies of Pumps, in which the Suckets having drawn the VVater when they
were pulled up, they both pressed it violently into a Pipe which was
fastned at the bottom of the Body of the Pump when they went down. For
the VVater by the Impulsion of the Sucket, was forced to enter into
these Pipes, because it could not go out by the Openings by which it
entred, because of the Suckets which stopped them, these two Pipes were
joyned together in a _Tambour_, which had likewise its Suckets, which
hindred the VVater from descending into the Bodies of the Pumps, after
it had been pressed into the _Tambour_, or _Vase_, which had another
Pipe, through which the VVater was forced as high as they pleased, by
Impulsion of the Suckets.

[Sidenote: _Lib. 10. Chap. 10._]

All these _Machines_ were either _moved_ by Strength of Men, or by
VVater-Mills, according to the convenience of the place.

ART. V.

_Of Water-Mills for Grinding of Corn._

[Sidenote: _Lib. 10. Chap. 10._]

_Water-Mills_ were moved by the help of a great VVheel which had many
VVings, which were forced by the Current. The Axle-tree of this great
VVheel, traversed another VVheel which had Cogs, which made the
_Lanterne_ or _Trundle-head_ go, which was placed Horizontally, which
was traversed by a Beam of Iron, which entred through above, into an
Iron in form of a VVedge, which helped to fasten the Beam in the
Mill-stone, above which was the Mill-Hopper, in form of a Funnel.

ART. VI.

_Of other Hydraulick Machines._

There were many other _Machines_ which moved by the help of the VVater,
as _Hour-Glasses_, _Organs_, _Machines_ for Measuring the VVays, and
knowing the swiftness or slowness of Sailing.

The _Hour-Glasses_ marked the Hours by the help of VVater, which passing
slowly, a little hole made at the bottom of a Vessel, and fa