_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 falling into
another, in elevating it self insensibly in the Vessel which it filled,
raised a piece of Cork, which hanging at one of the ends of a Chain
wrapped about an Axle-tree, and which had at the other end a little Bag
full of Sand, and a little lighter than the Cork: for this Chain
turning, the Axle-tree likewise turned a Pin or Hand, which marked the
Hours upon a Dial.
[Sidenote: _Lib. 10. Chap. 12._]
The _Organs_ played by help of two Suckets, which were pulled up or let
down in the Bodies of the Pump. The Suckets pushed the Air with violence
into a Funnel reversed in a Copper Coffer half full of VVater, and
pressed the Water, and constrained it to ascend round about within the
Coffer, which made that its weight in making it re-enter into the
Funnel, pushed the Air into the Pipes, and made them Play, producing the
same Effects that the Bellows did.
[Sidenote: _Lib. 10. Chap. 14._]
They measured the way that the Ships make by the help of a little Mill,
which was fastned to the Ship, and which turned by the resistance that
its VVings found in the VVater when the Ship went forward and the
Axle-tree of this Mill had a little Rong or Tooth, which every round
pushed forwards one of the Teeth of the great VVheel, which turned
another, and that another which turned a Pin or Handle, which marked the
number of turnings, that the Mill made, by which means it was easie to
take an account of the Perches, and Leagues that the Ship sailed.
They made use of the same _Machine_ on the Land, fixing to the Nave of
the VVheel of a Coach, a Tooth which made many VVheels be turned as in
the above-mentioned _Machine_, at the last of which, was fastned a Pin
or Handle, which marked the number of Perches and Leagues. This
_Machine_ had likewise a sort of a Counting VVheel, which at every Mile
that the Coach went, let a Pibble fall into a Vessel of Brass, to give
notice that they had gone a Mile.