We are speaking, be it
understood, of pumps that are controlled mechanically. In the one that
we are about to describe, things take place far otherwise. In measure as
the pressure increases, the stroke of the piston diminishes, and when it
has reached its maximum, the motion of the piston ceases entirely. If,
during the operation progression undergoes more or less variation,
that is, for example, if it diminishes at a given moment to afterwards
increase, the stroke of the piston undergoes all the influences of it.
The pump of which we speak is shown in Figs. 16 to 21, and is the
invention of Messrs. Laurent Bros. & Collot. It may be described briefly
as follows:
The apparatus, as a whole, has for base a cast-iron reservoir; A, to the
top of which is fixed the pump properly so-called, B, as well as the
clack box, A, and safety valve. The pump is placed opposite an upright,
D, whose top serves as a guide to the prolongation, E, of the piston
rod. This latter is traversed by a pivot, a (Fig 19), on which is
mounted a lever, F, whose outer extremity is articulated with a
connecting rod, G, which is itself connected with the cranked shaft,
G. This shaft has for its bearings two supports, b, attached to the
reservoir, and carries the driving pulleys and a fly wheel.
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