AN IMPROVED JOINT FOR CONNECTING THE SUPPLY PIPE WITH THE PENDANT PIPE OF MOVABLE PENDANT LAMPS EMPLOYED TO ILLUMINATE SHOP FRONTS OR THE Hone
Year: 1872

page_text: LETTERS PATENT to Samuel Swain, of Bradford, in the County of
York, Mechanical Engineer, for the Invention of "AN IMPROVED
JOINT FOR CONNECTING THE SUPPLY PIPE WITH THE PENDANT PIPE OF
MOVABLE PENDANT LAMPS EMPLOYED TO ILLUMINATE SHOP FRONTS OR THE
Hone"
PROVISIONAL SPECIFICATION left by the said Samuel Swain at the
Office of the Commissioners of Patents, with his Petition, on the
30th September 1872.
I, SAMUEL SWAIN, of Bradford, in the County of York, Mechanical
Engineer, do hereby declare the nature of the said Invention for "Ax
IMPROVED JOINT FOR CONNECTING THE SUPPLY PIPE WITH THE PENDANT PIPE OF
MOVABLE PENDANT LAMPS EMPLOYED TO ILLUMINATE SHOP FRONTS OR THE
EXTERIOR OF BUILDINGS AND OTHER LIKE USES," to be as follows:-
This Invention relates to the construction of improved joints in
connection with the pendant or other moveable lamps employed to
illuminate shop fronts and the exterior of buildings. Heretofore such
joints have consisted of a taper stopper or plug, the latter being

page_text: received within a conical tube or socket, but it is found that the constant
removal of the lamps and plugs soon destroys the joint, so as to cause
loss of gas through leakage. Now my improvements consist in con-
structing such joints with a dish or other receptacle cast round the
socket, in which dish is deposited mercury. Attached to the "head" of
the plug is a ring or pendant flange, the lower portion of which dips into
the mercury contained in the dish above referred to, and so forms a
perfectly gas-tight joint or "trap," preventing the escape of gas, when
through wear the stopper or plug becomes faulty.
When the lamp and plug are removed a small cup or cover is placed
over the socket and the receptacle containing the mercury to prevent rain
or dust lodging therein. The plug of the joint may be square so as to
prevent the lamp being turned or moved by high winds. This joint is
also applicable to other like uses.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Samuel Swain in the Great Seal Patent Office on
the 28th March 1873.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, Samuel
SWAIN, of Bradford, in the County of York, Mechanical Engineer, send
greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Thirtieth day of September, in the year of
our Lord One thousand eight hundred and seventy-two, in the thirty-
sixth year of Her reign, did, for Herself, Her heirs and successors,
give and grant unto me, the said Samuel Swain, Her special licence that
I, the said Samuel Swain, my executors, administrators, and assigns, or
such others as I, the said Samuel Swain, 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 "AN IMPROVED JOINT FOR CONNECTING
THE SUPPLY PIPE WITH THE PENDANT PIPE OF MOVABLE PENDANT LAMPS
EMPLOYED TO ILLUMINATE SHOP FRONTS OR THE EXTERIOR OF BUILDINGS AND OTHER
Like Uses;” upon the condition (amongst others) that I, the said Samuel

page_text: Swain, my executors or administrators, by an instrument in writing
under my, or their, or one of their hands and seals, 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 tho said Letters Patent.
NOW KNOW YE, that I, the said Samuel Swain, do hereby declare
the nature of my said Invention, and in what manner the same is to be
performed, to be particularly described and ascertained in and by the
following statement, and accompanying Sheet of Drawings, that is to
say:―
This Invention relates to the construction of improved joints in
connection with the pendant or other movable lamps employed to
illuminate shop fronts and the exterior of buildings. Heretofore such
joints have consisted of a taper stopper or plug, the latter being received
within a conical tube or socket, but it is found that the constant removal
of the lamps and plugs soon destroys the joint so as to cause loss of gas
through leakage. Now, my improvements consist in constructing such
joints with a dish or other receptacle cast round the socket, in which
dish is deposited mercury. Attached to the "head" of the plug is a
ring or pendant flange, the lower portion of which dips into the mercury
contained in the dish above referred to, and so forms a perfectly gas-tight
joint or trap" preventing the escape of gas when through wear the
stopper or plug becomes faulty.
"
When the lamp and plug are removed a small cap or cover is placed
over the socket and the receptacle containing the mercury to prevent
rain or dust lodging therein. The plug of the joint may be square so as
to prevent the lamp being turned or moved by high winds.
Such being the nature and object of this my said Invention, I will
now proceed to describe the same in detail, and in order that the
Invention may be clearly understood I have hereunto annexed a Sheet
of Drawings, and have marked the same with figures and letters of
reference, the same letter referring to the same part in the various views
or figures.
Fig. 1 is a sectional elevation of a gas joint constructed according to
this my
said Invention; Fig. 2. is a plan view; Fig. 3 is a sectional
plan through the lines A, B, of Fig 1; and Fig. 1 is elevation of

page_text: the apparatus, with lamp and plug removed, and the cap or cover placed
over the socket and receptacle containing the mercury.
D is the plug, the lower portion E of which dips into the mercury con-
tained in the dish C above referred to, and so forms a perfectly gas-tight
joint or "trap," preventing the escape gas when through wear the stopper
or plug becomes faulty. When the lamp and plug D are removed a small
cap or cover F is placed over the socket and dish C containing the
mercury to prevent rain or dust lodging therein. The plug of the joint
may be square, as shewn by dotted lines ×, Fig 2, so as to prevent the
lamp being turned or moved by high winds.
Having thus described the nature and particulars of this my
Invention, I would have it understood that what I claim as my
Invention is the use or employment of the dish or receptacle containing
mercury as and for the purpose herein fully described and shewn in the
Drawings.
In witness whereof, I, the said Samuel Swain, have hereunto set
my hand and seal, this Twenty-seventh day of March, in the year
of our Lord One thousand eight hundred and seventy-three.
Witness,
WALTER BRIERLEY,
Tasker & Brierley,
Patent Agents,
Halifax & Bradford.
SAMUEL SWAIN. (L.S.)