IM- PROVEMENT IN BLOCKS OR 'INVERTS' USED IN THE FORMATION OF DRAINS AND SEWERS
Year: 1876

page_text: LETTERS PATENT to Edward Brooke, of the Field House Fire-clay Works,
near Huddersfield, in the County of York, for the Invention of AN IM-
PROVEMENT IN BLOCKS OR 'INVERTS' USED IN THE FORMATION OF DRAINS
AND SEWERS."
Sealed the 8th May 1877, and dated the 11th November 1876.
PROVISIONAL SPECIFICATION left by the said Edward Brooke at the Office
of the Commissioners of Patents on the 11th November 1876.
EDWARD BROOKE, of the Field House Fire-clay Works, near Huddersfield, in
the County of York. "AN IMPROVENENT IN BLOCKS OR 'INVERTS' USED IN
THE FORMATION OF DRAINS AND SEWERS."
This Invention consists in forming such blocks or inverts so that they shall fit
one within the other (that is) one block or invert having a projection at one end so
as to fit into a recess formed in the end of another block or invert, or both pro-
jections may be made in the other block, so that when put together they shall
form a full or whole "socket joint." Hitherto such blocks or inverts have been
made with "jump joints," and with "lapped joints," and with "half socket joints,"
but such joints are found to be ineffective in preventing the sinking of the block or
invert in soft or sandy ground.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Edward Brooke in the Great Seal Patent Office on the 11th May
1877.
EDWARD BROOKE, of The Field House Fire-clay Works, near Huddersfield, in
the County of York. "AN IMPROVEMENT IN BLOCKS OR 'INVERTS' USED IN
THE FORMATION OF DRAINS AND SEWERS."
This Invention consists in forming such blocks or "inverts" so that they shall
fit one within the other; that is, one block or "invert" having a projection at one
end so as to fit into a recess formed in the end of another block or "invert," or both
Posice AJ1

page_text: projections may be made on one block and both recesses made in the other block,
so that when put together they shall form a full or whole "socket joint." Hitherto
such blocks or "inverts have been made with "jump joints," and with "lapped
joints," and with "half socket joints," but such joints are found to be ineffective in
preventing the sinking of the block or "invert" in soft or sandy ground.
In order to shew the application of my Invention and how the same is put into
practice, I annex the accompanying Sheet of Drawings illustrative thereof:-
Figs. 1, 2, and 3, shew the projection A as being a part of the invert, and Fig. 4
shews the other end of the invert with a recess B formed therein corresponding in
shape and size to the projection, so that when two inverts are placed together they
form a full, continuous, or whole socket joint capable of sustaining great pressure
without fear of either end of the invert sinking or being displaced in soft or sandy
ground, as is often the case with inverts made with plain or lapped joints.
Fig. 5 shews a longitudinal section of two inverts together with the projection A
in its place.
Instead of each invert being made with a projection at one end and a recess at
the other end both projections may be on one invert and both recesses in the other
invert.
Having now described the nature of my Invention and shewn how the same is
carried into practice, I would have it understood that I claim as my Invention the
application of the projection A and recess B formed on and in blocks or inverts as
and for the purpose herein described.
In witness whereof, I, the said Edward Brooke, have hereunto set my hand
and seal, this 7th day of May, in the year of our Lord One thousand
eight hundred and seventy-seven.
Witness,
JOHN FIRTH.
EDWARD BROOKE. (L.S.)