AN IMPROVED APPARATUS FOR INDICATING AND REGISTERING THE FLOW OR SUPPLY OP AIR TO MINES, AND OTHER PLACES REQUIRING VENTILATION
Year: 1857

page_text: recters
LUCO
by the Act.)
PROVISIONAL SPECIFICATION left by Benjamin Keightly at the Office of
the Commissioners of Patents, with his Petition, on the 19th November
1857.
I, BENJAMIN KEIGHTLEY, of Lofthouse, Wakefield, in the County of York,
Coal Viewer, do hereby declare the nature of the said Invention for "AN
IMPROVED APPARATUS FOR INDICATING AND REGISTERING THE FLOW OR SUPPLY OP
AIR TO MINES, AND OTHER PLACES REQUIRING VENTILATION," to be as follows:-
This apparatus consits of a case provided with a dial and pointers, and of a
The upper
vane or wind pendulum suspended from the interior of the case.
part of the pendulum rod is formed with a toothed piece or quadrant, in gear
with a pinion to which one of the pointers is attached, which thus works with
the pendulum and indicates the force of the current. Another pointer, carry-
ing a stud and intended to register any variation of the supply of air, is
lodged or held loosely in a socket, and may be moved by hand to correspond
with any position of the pendulum, and is held so by a spring in place; but
should the current of air be varied, this registering pointer will be moved by
the movement of the pendulum, so as to denote the altered amount of air
admitted, and will remain so until reset; or there may be two such registering
pointers similarly loosely fitted, each carrying a stud and held in place by a
spring, and one being on each side of the pendulum or indicating pointer,

page_text: and acted on by the movement of the pendulum, ono will register the highest
and the other the smallest quantity of air admitted. Tho timepiece may be
so adapted to the apparatus as to be capable of being stopped by a con-
trivance on the upper part of the pendulum or vane rod. The dial is
graduated or divided into degrees or spaces, which should correspond with
the dimension of the vane, which may conveniently be a definite portion
of a square foot, and which I prefer to form of a light metal frame, covered
with oil silk or other light material impervious to air. The case is so con-
trived that it can be locked. For ensuring delicacy of action the pendulum
should be balanced by a counterpoise.
I now proceed to illustrate the working of the apparatus:-Suppose it be
desired to register, any deviation, as for example, any reduction from the
supply of air determined on for the healthy ventilation of a mine or pit, the
pendulum pointer working with the pendulum will indicate the greatest force
of the current; by its clovation the registering pointer is set in proper position
to correspond with the situation of the pendulum. Should the current be
varied (say diminished), the pendulum or indicating pointer will come in con-
tact with the stud on the registering pointer, and move such pointer or cause
it to travel backward on the dial, so as to denote the lowest amount of air
supplied, in which position it will remain until reset by hand, thereby regis-
tering the variation; the time of its occurrence being recorded by the stopping
of the timepiece by a wire or catch on the pendulum.