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 three 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 three cranks, with one or two high-
pressure cylinders for the first stage of expansion, and two cylinders each for the
intermediate or second stage and the low-pressure or third stage. When adopting a
single high-pressure cylinder I connect its piston to the middle crank, and arrange
an intermediate and low-pressure cylinder tandem in connection with each of the
other cranks. When adopting two high-pressure cylinders I either place them
tandem in connection with the middle crank the other cylinders remaining as herein-
before described; or I arrange the two intermediate cylinders tandem in connection
with the middle crank, the high-pressure cylinders being each arranged tandem with
a low-pressure cylinder in connection with the other cranks; or I arrange one high-
pressure cylinder tandem with an intermediate cylinder, in connection with the middle
cylinder and the other high-pressure and intermediate cylinders each tandem with a
low-pressure cylinder in connection with the other cranks. 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 the smaller cylinder
may be placed nearer the crank shaft 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 three
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 1
drawings to be hereinafter referred to, and comprising three figures, each of which
is a sido elevation of a set of engines for driving the screw propeller as mado
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 three cranks, G 1, G2, G3, with one or
two high-pressure cylinders, A1, A2, for the first stage of expansion, and two
cylinders each, B1, B2, C1, C2, for the intermediate or second stage and the
low-pressure or third stage.
When adopting a single high-pressure cylinder, A 1, as shown in figure, 1, I
connect its piston to the middle crank, G 2, and arrange an intermediate and
low-pressure cylinder, B1, C1, and B2, C2, tandem in connection with each of
the other cranks, G 1, G 3. When adopting two high-pressure cylinders, A 1, A 2,
I either place them tandem, as indicated partly in dotted lines in figure, 1, in connection
with the middle crank, G 2, the other cylinders remaining as hereinbefore described;
or I arrange the two intermediate cylinders, B 1, B2, tandem in connection with the
middle crank, G 2, as shown in figure, 2, the high-pressure cylinders, A 1, A 2, being
each arranged tandem with a low-pressure cylinder, C1, C2, in connection with the
other cranks, G 1, G 3. Or as shown in figure, 3, I arrange one high-pressure
cylinder, A 1, tandem with an intermediate cylinder, B 1, in connection with the middle
crank, G2, and the other high-pressure and intermediate cylinders, A2, B2, each
tandem with a low-pressure cylinder, C1, C2, in connection with the other
cranks, G 1, G 3.
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
the smaller cylinder may be placed nearer the crank shaft if considered more

page_text: convenient in any case. The two 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 caso.
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 three stages of expansion, combining
five or six cylinders with three cranks substantially in the manner hereinbefore
described with reference to figure, 1, of tho accompanying drawings.
2-In compound steam engines working with three stages of expansion, combining
six cylinders with three cranks substantially in the manner herein before described with
reference to figure, 2, of the accompanying drawings.
3-In compound steam engines working with three stages of expansion, combining
six cylinders with thrco cranks substantially in the manner hereinbefore described
with reference to figure, 3, of the accompanying drawings.
Dated this Twenty-first day of October 1887
EDMUND HUNT,
Applicant's Agent.