of an Engine and the Boiler Pressure
Year: 1885

page_text: of an Engine and the Boiler Pressure."
1
I JOHN BROWN MOSCROP of Lorne Villa Urmston in the County of Lancaster,
Consulting Engineer do hereby declare the nature of my invention of "IMPROVE-
MENTS IN APPARATUS FOR RECORDING SIMULTANEOUSLY THE PERFORMANCE of A
STEAM ENGINE AND THE BOILER PRESSURE," to be as follows:--
This invention refers to improvements upon an invention for which Letters
Patent No 1321 were granted to me on the 24th day of March 1881 and has for
its object the utilising of the same paper strip upon which the performance of
the engine is recorded for the purpose of at the same time recording the boiler
pressure.
In carrying out my present invention I prefer to mount a "Bourdon" tube
adjacent to the travelling paper strip and which tube is internally in communication
with the boiler through a suitable pipe-the free end of the said tube being
provided with a pointer or index finger sweeping over a graduated dial to give the
indication of the pressure and also communicating through a suitable link with a
pencil or other marker. In this manner I am enabled to obtain a permanent record
of the boiler pressure by preference upon the same paper strip which records the
performance of the steam engine.
Instead of a "Bourdon" tube an elastic corrugated diaphragm or diaphragms
suitably mounted might be substituted for similarly recording the boiler pressure.
JOHN G. WILSON,
Agent for Applicant.

page_text: - of an Engine and the Boiler Pressure.
L
I JOHN BROWN MOSCROP of Lorne Villa, Urmston, in the County of Lancaster,
Consulting Engineer do hereby declare the nature of my invention and in what
manner the same is to be performed, to be particularly described and ascertained
in and by the following statement :-
This invention refers to improvements upon an invention for which Letters
Patent No 1321 were granted to me on: the 24th day of March 1881, and has for
its object the utilising of the same paper strip upon which the performance of
the engine is recorded for the purpose of at the same time recording the boiler,
pressure.
In carrying out my present invention I prefer to mount a "Bourdon" tube
adjacent to the travelling paper strip and which tube is internally in communication
with the boiler through a suitable pipe, the free end of the said tube being
provided with a pointer or index finger sweeping over a graduated dial to give the
indication of the pressure and also communicating through a suitable link with a
pencil or other marker. In this manner I am enabled to obtain a permanent record
of the boiler pressure by preference upon the same paper strip which records the
performance of the steam engine.
And in order that this my said invention may be the more readily understood
and carried into practical effect I have hereunto annexed a drawing illustrative of
my improvements.
Fig. 1. is a plan view and Fig. 2. a front elevation of the upper part of my
improved engine recorder, the subject of Letters Patent N° 1321 A.D. 1881 shewing
also the application thereto of my present improvements.
In both views E is the drum provided with pins or projections E¹ taking into
corresponding holes F formed in the edges of the continuous strip or riband of
paper G upon which the record of the performance of the engine is taken by means
of the marker R mounted at the extremity of the recording rod Q as described in
my former specification.
The present improvements consist in the application of the "Bourdon " tube a
which is mounted as illustrated adjacent to the drum E carrying the continuous
paper strip G and which "Bourdon" tube is internally in communication with the
steam boiler whose pressure is required to be recorded through the pipe b. The
free end of the "Bourdon" tube a has affixed to it a pointer or index finger c
sweeping over a graduated segment of a dial d to give the indication of the
pressure but in order to obtain a continuous record of the pressure it is necessary to
provide some means of marking the position of the pointer upon the paper strip G.
This is conveniently done by the rod e pivoted at one extremity to the stud e¹
rising from the pointer c and provided at its other extremity with a revolving disc
or marker f which rests upon the paper strip G. And in order that this disc shall
produce the necessary mark or record upon the paper strip I also cause the same to
run in frictional contact with a bobbin or reel g carrying fibrous material saturated
with aniline ink or other similar marking liquid and which bobbin being mounted

page_text: loosely upon the fixed rod is thus capable of travelling to and fro in a transverse
direction across the paper strip G along with the recording disc.
In this manner I am enabled to obtain a permanent record of the boiler pressure
throughout the day or for any desired period upon the same strip of paper which
records the performance of the steam engine but which record could equally well
be obtained upon a separate and distinct strip of paper either carried by the same
roller as the steam engine recorder or, in case of a steam pressure recorder only
being required by similar mechanism to that described for actuating the paper strip
in my former specification.
Instead of connecting the index finger rigidly to the end of the "Bourdon"
tube it will be obvious that the said tube might be arranged vertically and the
connection be effected between the loose end of the said tube and the pointer by
means of a lever and rod.
Instead of a "Bourdon" tube, an elastic corrugated diaphragm or diaphragms
suitably mounted might be substituted for similarly recording the boiler pressure,
but these I should consider to be modifications of my invention.
Having thus particularly described and ascertained the nature of my invention
and in what manner the same is to be performed I declare that what I claim is
1st The improvements in steam engine recorders whereby the record of the boiler
pressure is obtained upon the same strip of recording paper as the performance of
the engine or upon a separate strip substantially as and for the purposes herein-
before described and illustrated on the accompanying drawing..
2nd The construction and arrangement of apparatus for recording steam boiler
pressure substantially as herein before described and illustrated on the accompanying
drawing.
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