Year: 1888

page_text: Jate of Application, 24th May, 1888
Complete Specification Left, 25th Feb., 1889
Complete Specification Accepted, 30th Mar., 1889
I THOMAS STRUTHERS MINNES, Whitefield Brass Works, Govan, County of
Lanark, Manufacturer, do hereby declare the nature of this invention to be as
follows:-
This invention which relates to improvements in engine indicators is a further
developmont of the invention.for which provisional protection No. 16258 dated
November 26th 1887 has been granted to me. Under the present invention the lower
end of the indicator cylinder in communication with the steam stop cock has inserted
into it a guard to prevent the passage of grit into the cylinder along with the steam
the said guard consisting of a ferrule or short length of tube which is closed or
covered over at one end with a piece of wire gauze perforated zinc or other metal the
meshes or holes in which whilst they are sufficiently close to prevent the passage of
grit into the cylinder are at the same time open enough to prevent the steam from
being "wire drawn." The ferrule or ring may be solid or it may be split so as to
constitute a spring whose tendency is to grip or hold against the interior surface of
the cylinder.
As described under my said previous application the cylinder is clad with a non-
conducting material, and in accordance with this invention the coupling ring by which
the cylinder is connected to the steam pipe and which ring has two horns or lugs
for convenience of turning it round has the non-conducting material secured to it
by first slipping a ring of the said non-conducting material over the coupling ring.
The horns or lugs are then passed through holes in the non-conducting ring and
screwed into the coupling ring the projecting parts of the lugs being then covered
with ferrules of non-conducting material which are held in place by nuts screwed
on to the outer ends of the lugs or by screws tapped into the said outer ends or
by equivalent means. The cylinder cover is also clad with a ring or disc of non-
conducting material which is or may be recessed on its under side to receive the
cover the material being secured in position by screws passed through it and through
the metal cover or by equivalent means.

page_text: Upon the bracket or arm supporting the drum on which the paper to receive
the indications is wound there is centred a detent consisting of a lever one end
of which is formed or provided with an upward projection capable of being brought
under and in contact with the lower end of the drum to fix or hold the drum in one
position when desired.
To adjust the length of the indicator cord a spring clip is provided the said clip
consisting of two jaws which are hinged or jointed together at or
near their
centres. To the rear end of one jaw the indicator cord is attached and froin thence it
passes through a hole in the rear of the other jaw thence between the forward
ends of both jaws to the indicator drum. By this arrangement the indicator cord
is with great facility adjusted according to the length of the "leader" cord the
adjustment being maintained by the forward ends of the jaws gripping the indicator
cord which they are caused to do by means of a spring.
Dated this Twenty-third day of May 1888
CRUIKSHANK & FAIRWEATHER,
62, Saint Vincent Street, Glasgow,
Agents.

page_text: Improvements in and relating to Engine Indicators.
I, THOMAS STRUTHERS MINNES Whitefield Brass Works, Govan, County of
Lanark, Manufacturer, 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 :-
This Invention which relates to improvements in engine indicators is a further
development of the invention for which Letters Patent No. 16258 dated November 26th
1887 have been granted to mo under the present invention which is illustrated on the
accompanying drawing the lower end of the indicator cylinder A in communication
with the steam stop cock has inserted into it a guard to prevent the passage of grit
into the cylinder along with the steam the said guard consisting of a ferrule or short
length of tube B which is closed or covered over at the top end with a piece C of wire
gauze, perforated zinc or other metal the meshes or holos in which whilst they are
sufficiently close to prevent the passage of grit into the cylinder are at the same time.
open enough to prevent the steam from being "wire drawn." The ferrule or ring
may be solid or it may be split so as to constitute a spring whose tendency is to grip
or hold against the interior surface of the cylinder A.
As described under my said previous application the cylinder is clad with a non-
conducting material A² and in accordance with this invention the coupling ring D by
which the cylinder A is connected to the steam pipe (and which ring.has two
horns or lugs for convenience of turning it round) has the non-conducting material
secured to it by first slipping a ring E of the said non conducting material over the
coupling ring D after which the horns or lugs F are passed through holes in the non-
conducting ring E and screwed into the coupling ring, the projecting parts of the
lugs being then covered with ferrules G of non-conducting material which are held in
place by screws H tapped into their outer ends or by equivalent means.
The cylinder
cover I is also clad with a ring or disc J of non-conducting material which is recessed
on its under side to receive the cover the material being secured in position by
screws K passed through it and through the metal cover 1 or by equivalent
means.
To adjust the length of the indicator cord L a spring clip is provided the said clip
consisting of two jaws M, M', which are hinged or jointed together at or near their
centres as shewn at N. To the rear end of the jaw M the indicator cord L is attached
and from thence it passes rearwards through a hole in the said jaw after which the
free end of the cord is doubled back through the hole and is thence conducted between
the forward ends of both jaws to the indicator drum O. On the doubled part of the
cord L a hook is placed for attachment of the cord L to the "leader" cord and by this
arrangement the indicator cord is with great facility adjusted according to the length
of the "leader" cord the adjustment being maintained by the forward ends of
the jaws gripping the indicator cord which they are caused to do by means of a
spring P.

page_text: Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed I declare that what I
claim is :-
1. In the steam cylinder of an engine indicator the use of a grit guard arranged
substantially as hereinbefore described.
2. For connecting the steam cylinder of an engine indicator to the steam
supply pipe a coupling ring clad with non-conducting material substantially as
described.
3. In an engine indicator cleading the cover of the steam cylinder with non-
conducting material substantially as described.
4. In conjunction with engine indicators a spring clip constructed substantially as
herein before described and the employment thereof for adjusting the length of the
indicator cord relatively with the leader cord.
Dated this Turntre thing dan of th
1000
CRUIKSHANK & FAIRWEATHER,
62, Saint Vincent Street, Glasgow,
Agents.