Year: 1874

page_text: LETTERS PATENT to Samuel Chandler, of 26, York Street, London
Road, Southwark, in the County of Surrey, Gas Engineer, and
George Wilson Stevenson, of 19, Great George Street, Westminster,
in the County of Middlesex, C.E., for the Invention of "IMPROVE-
COMPLETE SPECIFICATION filed by the said Samuel Chandler and
George Wilson Stevenson at the Office of the Commissioners of
Patents, with their Petition and Declaration, on the 23rd September
1874, pursuant to the 9th Section of the Patent Law Amendment
Act, 1852.
TO ALL TO WHOM THESE PRESENTS SHALL COME, we, SAMUEL
CHANDLER, of 26,-York-Street, London Road, Southwark, in-the-Gounty
of Surrey, Gas Engineer, and GEORGE WILSON STEVENSON, of 19, Great
George Street, Westminster, in the County of Middlesex, C.E., send
greeting.

page_text: WHEREAS we are in possession of an Invention for "IMPROVEMENTS IN
APPARATUS USED IN THE MANUFACTURE OF GAS," and have petitioned Her
Majesty to grant unto us, our executors, administrators, and assigns,
Her Royal Letters Patent for the same, and have made solemn
Declaration that we are the true and first Inventors thereof.
NOW KNOW YE, that we, the said Samuel Chandler and George
Wilson Stevenson, do hereby declare that the following Complete
Specification, under our hands and seals, fully describes and ascertains
the nature of the said Invention, and in what manner the same is to be
performed in and by the following statement thereof, that is to
say:
_
Our Invention is designed for removing the pressure from retorts used
in the manufacture of gas, which pressure is occasioned by the dip pipes
being sealed in the fluid of the hydraulic main. It is therefore this scal
which we purpose to remove during the time the gas is being generated,
and to replace when the retort is not in action, and we further purpose
that the apparatus to accomplish this sealing and unsealing be self-
acting.
Our Invention is an improvement upon that for which Letters Patent
were granted to Samuel Chandler, senior, Samuel Chandler, junior, and
Josiah Chandler, No. 2416, dated August 14th, 1872, and the improve-
ment is effected by the addition of a cup vessel, marked A on Drawing,
placed upon the top of the dip pipe. This vessel may be charged with
mercury, water, tar, or other liquid, and into it is introduced a holder or
enclosed cylinder marked B on Drawing. This holder or enclosed
cylinder is connected by a rod marked C to the moveable dip pipe D,
which rises and falls in the cup E, which may also be charged with
mercury, tar, or other liquid, and in the water of the hydraulic
main.
To the top of the holder is attached a chain or cord which passes over
a pulley F and sustains a counterbalance weight G.
The action of the apparatus is as follows:-When the retort has been
charged with coal or other gas producing substance and the lid secured
the gas evolved will cause the holder to rise, which will lift the dip pipe
out of the fluid in the hydraulic main, and when gas ceases to be a
evolved or the lid of the retort is removed, then the holder will fall, and

page_text: with it the dip pipe, which will become sealed, and so continue until the
retort has been again charged and the lid secured.
Having thus described the manner in which our Invention is carried
into effect, we wish it to be understood that we do not limit ourselves to
the precise details herein-before described, as the same may be varied
without departing from the nature of our said Invention, but what we
do claim as our Invention is, the sealing and unscaling of dip pipes or
their equivalents by means of the self-acting apparatus described in this
Specification, and shown on the Drawing annexed.
In witness whereof, we, the said Samuel Chandler and George
Wilson Stevenson, have hereunto set our hands and seals, this
Twenty-second day of September, in the year of our Lord Onc
thousand eight hundred and seventy-four.
SAMUEL CHANDLER.
(L.S.)
GEORGE WILSON STEVENSON.
(L.S.)