AN APPARATUS FOR PREVENTING EXCESSIVE OSCILLATIONS IN GOVERNORS
Year: 1884

page_text: PELLEGRIN (LOUIS ANTOINE VICTOR) 2 Chadstone Villas, Lebanon gardens
Wandsworth, Surrey Civil Engineer do hereby declare the nature of said inven-
tion for "AN APPARATUS FOR PREVENTING EXCESSIVE OSCILLATIONS IN GOVERNORS,"
to be as follows:-
33.
In order to ensure the uniform movement of a machine the motive power must
be very regular, the exactitude of the former depending on the latter. For this
We have a cast.
purpose we use a quick silver brake of the following construction.
iron bell moved by a vertical rod fixed as direction with vertical edge very thin
in order to have a weight almost constant. This bell is surrounded by an
immovable bell containing quick silver and from which it is separated by a small
distance. A slight displacement of the movable bell brings about a great difference
in the level and from this cause a very powerful check. The movable bell has an
opening to be regulated by a transverse screw. The quick silver passes through
this opening and reestablishs the levels with a speed which is to be regulated by
the screw.
This kind of brake acting quickly and being very sensitive, by the absence of
any friction is much superior for these reasons to the oil brakes in which pistons
are used being quicker and more exact in the action.
This quick silver brake can be applied to any governor and apparatus to be kept
in equilibrium in which the check to the excess of movement caused by the inertia
of the pieces moved must take place quickly. In fixing this brake on a rod moved
by the governor of a steam engine, the movement of the governor will be corrected
and the shakings produced by the excesses of movement of the governor avoided.
Thus we will give to the governor delicacy and surety of action and ensuring a
regular working the regular movement of the machine to be driven will be ensured
no matter what speed.
1
1001"

page_text: I, LOUIS ANTOINE VICTOR PELLEGRIN of 2 Chadstone Villas, Lebanon gardens
Wandsworth in the County of Surrey Civil Engineer do hereby declare the nature
of my invention for AN APPARATUS FOR PREVENTING EXCESSIVE OSCILLATIONS IN
GOVERNORS, and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement:
Our apparatus which we call a quick silver brake acts and is constructed as
follows: In its movement the governor of the machine drives a vertical stem R
which is guided the said vertical stem R moving a cast iron cylinder M with very
thin vertical walls E E so that we may have a nearly constant weight. This
_cylinder is surrounded by a fixed cylinder F very little distant from the other.
A slight displacing of the movable cylinder M causes a great difference in the
levels and thence a very powerful check.
The movable cylinder M is provided with an opening O to be regulated by means
of a screw S. The mercury passes through the opening O and reestablishes the
levels at a speed which is to be regulated.
As it is to be seen this brake acts quickly and will be very sensible because no
friction takes place; besides it is preferable to the oil pistons by the reason that
oil clogs in time.
This quick silver brake is applicable to any governor and equilibrium apparatus
in which the check is to be made quickly and without expenditure of power.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is
1 The construction of a brake, substantially as described and illustrated in the
foregoing specification and drawing.
2 The use of.a fixed and a movable cylinder as described or any similar arrange-
ment by which a great difference is quickly obtained in the levels of the liquids
which can be reestablished at a speed which is to be regulated.
Dated this 29th day of December 1884.