AN IMPROVED AUTOMATIC DIP-PIPE TO BE USED IN THE MANUFACTURE OF GAS
Year: 1881

page_text: LETTERS PATENT to Samuel Chandler, of 104, Newington Causeway, in the
County of Surrey, Gas Engineer, and George Wilson Stevenson, of 38,
Parliament Street, in the City of Westminster, Civil Engineer, for an
Invention of "AN IMPROVED AUTOMATIC DIP-PIPE TO BE USED IN THE
MANUFACTURE OF GAS."
PROVISIONAL SPECIFICATION left by the said Samuel Chandler and George
Wilson Stevenson at the Office of the Commissioners of Patents on the
22nd March 1881.
SAMUEL CHANDLER, of 104, Newington Causeway, in the County of Surrey, Gas
Engineer, and GEORGE WILSON STEVENSON, of 38, Parliament Street, in the City
of Westminster, Civil Engineer. "AN IMPROVED AUTOMATIC DIP-PIPE TO BE.
USED IN THE MANUFACTURE OF GAS."
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 seal 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 propose that the apparatus to accomplish this
sealing and unsealing be self acting and capable of guarding against the effects of
back pressure of gas.
This Invention is an improvement upon the self acting moveable dip pipe for
which Letters Patent were granted to the present inventors, No. 3252, September
23rd, 1874, and the improvement is effected by the addition of a pipe placed
between the lower cup and moveable pipe.
This additional pipe which is stationary may be made a part of the casting, to
which is attached the upper cup in which a small holder works, or it may be a
separate piece as found most convenient; this pipe is placed inside the hydraulic
main and within a short distance of the fluid therein, and the end of the moveable
pipe when out of the fluid is about level with this pipe and the gas has an
unobstructed passage, but when the moveable pipe is sealed in the hydraulic main,
should a back pressure of gas occur from any cause the liquid will rise and seal the
ends of both pipes, and thus a complete and sound shut off will be made between
the hydraulic main and the retort; then on the other hand should a back pressure
occur whilst the retort is in action and the dip pipe unsealed, we meet the
emergency by applying a small valve attached to the top of the small holder,
which fits into a suitable joint made in or attached to a cover which is placed at
the upper part of the top cup of the apparatus.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Samuel Chandler and George Wilson Stevenson in the Great
Seal Patent Office on the 22nd September 1881.
SAMUEL CHANDLER, of 104, Newington Causeway, in the County of Surrey, Gas
Engineer, and GEORGE WILSON STEVENSON, of 38, Parliament Street, in the City
of Westminster, Civil Engineer. "AN IMPROVED AUTOMATIC DIP-PIPE TO BE
USED IN THE MANUFACTURE OF GAS."
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 seal 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 propose that the apparatus to accomplish this
sealing and unsealing be self-acting and capable of guarding against ill effects of
back pressure of gas.
This Invention is an improvement upon the self acting movable dip-pipe, for
which Letters Patent were granted to the present inventors, No. 3252, September
28rd, 1874, and the improvement is effected by the addition of a pipe placed.
between the lower cup and moveable pipe.
This additional pipe which is stationary may be made a part of the casting, to
which is attached the upper cup in which a small holder works, or it may be a
separate piece as found most convenient; this pipe is placed inside the bydraulic
main and within a short distance of the fluid therein, and the end of the moveable
pipe when out of the fluid is about level with this pipe and the gas has an
unobstructed passage, but when this moveable pipe is sealed in the hydraulic main,
should a back pressure of gas occur from any cause the liquid will rise and seal
the ends of both pipes, and thus a complete and sound shut off will be made
between the hydraulic main and the retort; then on the other hand should a
back pressure occur whilst the retort is in action and the dip-pipe unsealed, we
meet the emergency by applying a small valve attached to the top of the small
holder, which fits into a suitable joint made in or attached to a cover which is
placed at the upper part of the top cup of the apparatus.
Having indicated what our improvement consists of, we now proceed more fully
to describe the nature thereof with reference to the accompanying Drawings.
The letter A at Figure 1 shews the stationary pipe which terminates within a
short distance of the fluid in the hydraulic main; the letter B is the moveable
portion, and when in action is also level with the aforesaid pipe, but when out of
action this pipe is immersed in the fluid of the hydraulic main and prevents any
back flow of gas; C is a small valve which fits into a seating when the gas is
being generated from the retort, which also prevents any escape should a back
pressure occur.
The action is as follows:-
Upon the retort lid being closed gas is evolved and lifts the small holder, which
also raises the pipe out of the fluid in bydraulic main and the gas passes without
bubbling through the seal, and at this point should a sudden back pressure take
place, the liquid in the main would rise up both the movable and stationary pipes
and a complete shut off would be the effect, and the liquid in the cups could not
become discharged.
Having now described our Invention and the way it is brought into effect, we
in conclusion desire to state that what we claim as our improvement is the

page_text: apparatus, as set forth, for relieving retorts from pressure, the other parts shewn
on Drawing and not described here already exist in the Letters Patent referred to,
No. 3252, and secured to the present inventors.
In witness whereof, I, the said Samuel Chandler, hereunto set my hand and
seal, this Twenty first day of September, in the year of our Lord One
thousand eight hundred and eighty one.
S. CHANDLER. (L.S.)