IMPROVEMENTS IN WORKING THE AIR PUMPS OF STEAM ENGINES
Year: 1853

page_text: LETTERS PATENT to Douglas Hebson, of 1, Dale Street, Liverpool,
in the County of Lancaster, for the Invention of "IMPROVEMENTS
IN WORKING THE AIR PUMPS OF STEAM ENGINES."
Sealed the 7th June 1853, and dated the 13th April 1853.
PROVISIONAL SPECIFICATION left by the said Douglas Hebson at
the Office of the Commissioners of Patents, with his Petition, on
the 13th April 1853.
I, DOUGLAS HEBSON, of 1, Dale Street, Liverpool; in the County of
Lancaster, do hereby declare the nature of the said Invention for "Iм-
PROVEMENTS IN WORKING THE AIR PUMPS OF STEAM ENGINES" to be as
follows:-
This Invention consists in causing the main driving crank of the
engine to be made so as to form an eccentric from which motion is
conveyed to work the air pump by connecting the excentric band or
hoop to the air pump'rod. *

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Douglas Hebson, in the Great Seal Patent Office,
on the 13th October 1853.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I,
DOUGLAS HEBSON, of 1, Dale Street, Liverpool, in the County of Lan-
caster, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Thirteenth day of April, in the year
of our Lord One thousand eight hundred and fifty-three, in the six-
teenth year of Her reign, did, for Herself, Her heirs and successors,
give and grant unto me, the said Douglas Hebson, Her special licence
that I, the said Douglas Hebson, my executors, administrators, and
assigns, or such others as I, the said Douglas Hebson, my executors,
administrators, and assigns, should at any time agree with, and no
others, from time to time and at all times thereafter during the term
therein expressed, should and lawfully might make; use, exercise, and
vend, within the United Kingdom of Great Britain and Ireland, the
Channel Islands, and Isle of Man, an Invention for "IMPROVEMENTS
IN WORKING THE AIR PUMPS OF STEAM ENGINES," upon the condition
(amongst others) that I, the said Douglas Hebson, by an instrument
in writing under my hand and seal, should particularly describe and
ascertain the nature of the said Invention, and in what manner the
same was to be performed, and cause the same to be filed in the Great
Seal Patent Office within six calendar months next and immediately
after the date of the said Letters Patent.
NOW KNOW YE, that I, the said Douglas Hebson, do hereby de-
clare the nature of the said Invention, and in what manner the same
is to be performed, to be particularly described and ascertained in and
by the following statement thereof (that is to say):
This Invention consists in causing the main driving crank of the
engine to be made so as to form an excentric, from which motion is
conveyed to work the air pump by connecting the excentric band or
hoop to the air pump rod.
Having thus stated the nature of my said Invention I will proceed
to describe the means of performing the same.

page_text: DESCRIPTION OF THE DRAWING.
Figure 1, represents a front elevation of the driving crank and crank
pin, with inverted eccentric on the same, for working the air pump.
A, A, is the centre portion or boss of the main driving crank; B, B,
eccentric, for working the pumps; C, the crank pin, to which motion is
given by the engine. The eccentric B, B, may be made solid or in one
piece, either with the crank or crank pin, or in a separate piece
properly secured to the crank pin.
Figure 2, is a side elevation of the same.
Figure 3, is a section of crank and eccentric made in one piece.
Figure 4, is a front elevation of an arrangement for the same purpose,
in which the crank itself is made to work as an eccentric. C, the
crank pin, as before; A, B, the eccentric crank.
Figure 5, is a side elevation of the arrangement in Figure 4. C, the
crank pin; D, D, the eccentric strap, conveying motion to the air pump;
S, S, in all the Figures represents the crank shaft.
I would remark that the other parts shown in the plans form no
part of my Invention, and are introduced merely to show more clearly
the mode of constructing the parts to which my Invention applies.
And I would state that I do not confine the application of my Inven-
tion to the particular arrangement of engine shewn. What I claim is
the arrangements or combinations of parts herein shown and described
for giving motion to the air pumps of steam engines.
In witness whereof, I, the said Douglas Hebson, have hereunto
set my hand and seal, this Eleventh day of October, in the year
of our Lord One thousand eight hundred and fifty-three.
DOUGLAS HEBSON. (L.S.)
Witness, GILBERT S. GOODWIN.