Improvements in the Construction of an Apparatus for Automatically Registering the Pressure of Gas.
Year: 1893

page_text: Date of Application, 6th Nov., 1893-Accepted, 9th Dec., 1893
COMPLETE SPECIFICATION.
Improvements in the Construction of an Apparatus for Automatically
Registering the Pressure of Gas.
We, FREDERICK COE of 6 West Avenue, Derby in the County of Derby,
Public Gas-lighting Inspector and ROBERT JOHN HARRISON of 30 Swinburne
Street, Derby aforesaid, Civil Engineer, do hereby declare the nature of this
invention and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement :-
The object of our invention is to provide an apparatus for automatically
registering the pressure of gas and is specially designed for use in connection with
street lamps or for private use in factories or warehouses or wherever a small and
portable pressure gauge and register may be required.
In order that our invention may be the more readily understood we have caused
to be annexed to this Specification two sheets of drawings for reference in
connection with the letterpress and upon which :-
Figure 1 is a vertical section on line a. a.
Figure 2 is a plan on line b. b.
Figure 3 is a plan on line c. c.
The drawings referred to being made to a scale of about three quarters of the
full size.
In carrying out our said invention we provide a vessel or receptacle_divided
internally into compartments A, A' and having a socket or female screw B on the
underside thereof adapted to fit or screw on the service pipe, or we may fix it
thereto by any other suitable means, from this joint there pass three tubes C, C1, C2;
C¹ and C communicate with and supply gas to the governors and burners D, D',
and the tube C supplies gas to the pressure gauge. The division E between the
two compartments of the vessel or receptacle is securely fixed at the top of the said
receptacle the joint here and at the sides being water and gas tight, the bottom of
the division does not quite touch the bottom of the receptacle but is kept say an
eighth of an inch therefrom to permit the water or other liquid to flow backwards
and forwards according to the pressure of the gas as will be hereafter explained,
we may however provide other means of communication between the two parts of
the receptacle such as perforations or the like in the lower portion of the division.
The compartment A' is provided with a loose cover or lid I.
Water or petroleum or other suitable liquid is poured into the vessel A' until it
reaches the level of the outlet F which is then closed with a cap G an opening H
communicating with the opposite part of the vessel is provided for pouring in the
water or other liquid. The tube C is carried sufficiently far above the level of the
water or other liquid in the vessel A, the pressure of the gas forcing the water in
the other compartment A¹ to take a higher level and carry with it a float J the
latter carrying a rod K working in suitable bearings, upon this rod is a transverse
cylinder or tube L in which is placed a pencil M kept (by means of an elastic band
or spring N and a piston O, or other suitable means) normally pressed up to a
drum P upon which are fixed suitably divided papers, the said papers being divided
round the periphery of the drum into hours and parts thereof and vertically into
inches and decimals or any other suitable system of dividing may be adopted; the
drum P is caused to revolve slowly, being geared to the hour wheel of a clockwork
mechanism Q, the latter not being shewn in detail upon the drawings.
It will be seen that as the pressure from the gas upon the liquid in the vessel or
receptacle A is greater or less the pencil attached to the vertical rod of the float
will mark upon the paper on the drum P the variations of the said pressure during
any given time, the position of the pencil being adjusted to mark zero or any

page_text: starting point upon the registering paper when the liquid is at its normal level,
that is to say when there is no pressure of gas upon it and when it is level with the
overflow as shewn upon Figure 1.
The clockwork mechanism is carried upon any suitable framework such as shewn
fixed to vertical pillars or columns R, R', fitting into recesses S, S' prepared for
same in the vessel A, the said pillars or columns R, R¹, carry also a light
framework T through which passes the guide rod K, to the said guide rod are
fixed arms U, carrying rollers V, V₁ which bear upon the sides of the light
standards T', T2 of the framework T to steady the action of the float and pencil
and to avoid friction.
It is evident that the details of this framework may be varied according to
circumstances but the apparatus herein described and illustrated is specially
designed for use in street lamps, therefore the parts are kept as small as is
compatible with efficient working, it will however be readily understood that we
may apply our invention for testing and registering the pressure of any gas.
Our
invention will also be found useful as a "tell tale" for indicating the time the lamp
is extinguished the float then falling and the pencil dropping down to zero on the
registering paper.
We may provide any suitable cover for the upper part of our apparatus such
as W the same being preferably made to fit down over the ends of the tubes C¹, C³,
upon which are screwed or fixed the governors firmly securing the said cover in
position. It is evident also that we may use any number of governors and burners
in connection with our apparatus.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we declare that what we
claim is :-
1. In an apparatus for automatically registering the pressure of gas a vessel or
receptacle divided into compartments A, A' adapted to fit upon or to any gas
service pipe and being provided with inlet and outlet as shewn and carrying
governors and burners and an automatic apparatus for registering the pressure of
gas substantially as herein described and illustrated on the accompanying sheets of
drawings.
2. In an apparatus for automatically registering the pressure
of gas
the
employment of a float such as J operated by the pressure of the gas upon water or
other liquid inside such a vessel or receptacle divided into compartments A, A', in
cembination with a guide rod carrying arms and rollers V, VI, and pencil M adapted
to mark upon registering papers according to the pressure of the said gas, the said
papers being affixed to a drum P caused to revolve by clockwork or other suitable
mechanism substantially as described herein and as illustrated on the accompanying
sheets of drawings.
3. The whole substantially as and for the purposes herein described and
illustrated by the accompanying sheets of drawings.
Dated this 4th day of November 1893.
W. SWINDELL,
Agent for the Applicants.