Year: 1887

page_text: Date of Application, 26th Jan., 1887
Complete Left, 22nd Oct., 1887
Complete Accepted, 22nd Nov.. 1887
I, FREDERICK BRUCE MURRAY HARMAN, of 10 Hamilton Terrace West, Partick,
in the County of Lanark, North Britain. Engineer, do hereby declare the nature of
this Invention to be as follows, that is to say:-
My said Invention has for its object to arrange or combine the parts of compound
steam engines in an improved manner, and so as whilst working with four stages of
expansion to be very suitable, although not exclusively so, for marine engines of large
power, and to have the various strains well distributed and the parts all conveniently
accessible.
In carrying out my Invention I employ five or six cylinders in connection with
three cranks two of the cylinders, and in some modifications three of them being low-
pressure or fourth-stage cylinders. When three fourth-stage cylinders are adopted
arrange the first-stage, second-stage, and third-stage cylinders each tandem with one
of the fourth-stage cylinders. In the modifications having each two fourth-stage
cylinders 1 arrange these cylinders in connection with the outer cranks, and in con-
nection with the middle crank I arrange one or two third-stage cylinders, or a third-
stage and a second-stage cylinder, or a single second-stage or first-stage cylinder, the
remaining two cylinders being arranged tandem with the two fourth-stage cylinders.
In general I prefer to place the larger cylinder of each tandem pair nearer the crank
shaft but the reverse arrangement may be adopted if considered more convenient in
any case.
Dated this Twenty-fifth day of January 1887.
EDMUND HUNT,
Applicant's Agent.

page_text: Improvements in Compound Steam Engines.
I, FREDERICK BRUCE MURRAY HARMAN, of 10 Hamilton Terrace West, Partick,
in the County of Lanark, North Britain, 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, that is to say :-
My said Invention has for its object to arrange or combine the parts of compound
steam engines in an improved manner; and so as whilst working with four stages of
expansion to be very suitable, although not exclusively so, for marine engines of
large power, and to have the various strains well distributed and the parts all
conveniently accessible.
To aid the explanation of my Invention I hereunto append two sheets of explanatory
drawings to be hereinafter referred to, and comprising three figures, each of which is
a side elevation of a set of engines for driving the screw propeller as made according
to my Invention. In these drawings the same reference letters and numerals are used
to mark the same or like parts. The figures are mere diagrams showing the general
arrangement in each case; and to show the course of the steam from cylinder to
cylinder pipes are represented as arranged in the most direct manner, whereas in
practice it may be more convenient to dispose them otherwise.
In carrying out my Invention I employ five or six cylinders in connection with
three cranks, G1, G2, G3, two of the cylinders, and in some modifications three of
them being low-pressure or fourth-stage cylinders, D1, D2, D3, the others being
either one or two first-stage cylinders, A 1, A 2, one second-stage cylinder, B 1, and
one or two third-stage cylinders, C1, C2.
Whon three fourth-stage cylinders, D1, D2, D3, are adopted as shown in figure, 1,
1 arrange one first-stage, A 1, one second stage, B 1, and one third-stage, C1, cylinder
each tandem with one of the fourth-stage cylinders, D1, D2, D3, the pistons of
these latter cylinders being each connected with the cranks, G1, G2, G 3. In the
modifications shown in figures, 2, and 3, having each two fourth stage cylinders, D1, D2,
I arrange these cylinders in connection with the outer cranks, G 1, G 3, and in con-
nection with the middle crank, G 2, I arrange two third-stage cylinders, C1, C2, as
shown in figure, 2, (or it might only be one third-stage cylinder (1), the remaining
first-stage cylinder, A 1, and second-stage cylinder, B1, being arranged tandem with
the two fourth-stage cylinders, D1, D2. Or as shown in figure, 3, one third-stage
cylinder, C1, and one second-stage cylinder, B 1, are arranged in connection with the
middle crank, G 2, two first-stage cylinders, A 1, A 2, being arranged tandem with
the two fourth-stage cylinders," D1, D2; or a single second-stage (B 1,) or first
stage (AI) cylinder may be arranged in connection with the middle crank, G 2,
the remaining two cylinders being arranged tandem with the two fourth-stage
cylinders D1, D2.
In general in each case in which cylinders of different sizes are combined tandem,
I prefer to place the larger cylinder of each tandem pair nearer the crank shaft, but

page_text: the smaller cylinder may be placed nearer the crank shaft if considered more con-
venient in any case. The two or three cylinders of any one stage may be made of
equal or unequal diameters as may be found best for an advantageous distribution of
strains in each case.
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. In compound steam engines working with four stages of expansion, combining
six cylinders with three cranks substantially in the manner herein before described
with reference to figure, 1, of the accompanying drawings.
2. In compound steam engines working with four stages of expansion combining
five or six cylinders with three cranks substantially in the manner hereinbefore
described with reference to figure, 2, of the accompanying drawings.
3. In compound steam engines working with four stages of expansion, combining
six cylinders with three cranks substantially in the manner herein before described
with reference to figure, 3, of the accompanying drawings.
4. In compound steam engines working with four stages of expansion connecting
a single second-stage or first-stage cylinder with a middle crank the remaining four
cylinders being arranged in tandem pairs with two outer cranks substantially as
herein before described.
Dated this Twenty-first day of October 1887
EDMUND HUNT,
Applicant's Agent.