IMPROVE- MENTS IN PRessure and Vacuum Gauges
Year: 1874

page_text: LETTERS PATENT to Thomas William Westerby, of Hawthorne Place,
New Wortley, and of the "Special" Works, Whitehall Road, Leeds,
in the County of York, Engineer, for the Invention of "IMPROVE-
MENTS IN PRessure and Vacuum Gauges."
PROVISIONAL SPECIFICATION left by the said Thomas William
Westerby at the Office of the Commissioners of Patents, with his
Petition, on the 9th October 1874.
I, THOMAS WILLIAM WESTERBY, of Hawthorne Place, New Wortley,
and of the "Special" Works, Whitehall Road, Leeds, in the County of
York, Engineer, do hereby declare the nature of the said Invention for
"IMPROVEMENTS IN PRESSURE AND VACUUM GAUGES," to be as follows:-
1
This Invention relates to the spring tubes of pressure and vacuum
gauges constructed on the well known "Bourdon" principle, and has
for its object the rendering of such tubes more durable than the ordinary
brass tubes hitherto employed, which from the nature of that alloy are
not only liable to corrosion, but frequently burst, thus constituting the
chief defect in gauges so constructed. I entirely obviate these defects
by constructing the spring tubes of the said apparatus of tempered.

page_text: copper, as I have found that this metal by reason of its toughness and
tenacity and non-liability to corrosion will stand more strain and will
not burst so readily as the ordinary brass tubes. In making these
improved tubes I either "draw" them from solid copper or I braze them,
that is to say, I use either "solid drawn" tempered copper tubes or 5
"brazed" tempered copper tubes.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Thomas William Westerby in the Great Seal Patent
Office on the 9th April 1875.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, THOMAS ]
WILLIAM WESTERBY, of Hawthorne Place, New Wortley, and of the
"Special" Works, Whitehall Road, Leeds, in the County of York,
Engineer, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Ninth day of October, in the year of 1
our Lord One thousand eight hundred and seventy-four, in the thirty-
eighth year of Her reign, did, for Herself, Her heirs and successors, give
and grant unto me, the said Thomas William Westerby, Her special
license that I, the said Thomas William Westerby, my executors, admi-
nistrators, and assigns, or such others as I, the said Thomas William 2
Westerby, 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 2
“IMPROVEMENTS IN PRESSURE AND VACUUM GAUGES," upon the condition
(amongst others) that I, the said Thomas William Westerby, my exe-
cutors 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 8
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 Thomas William Westerby, do hereby
declare the nature of the soid Invention
and:

page_text: is to be performed, to be particularly described and ascertained in and
by the following statement thereof :-
My said Invention relates to the spring tubes of pressure and vacuum
gauges constructed on the well known “Bourdon” principle, and has
for its object the rendering of such tubes more durable than the ordinary
brass tubes hitherto employed, which from the nature of that alloy are
not only liable to corrosion, but frequently burst, thus constituting the
chief defect in gauges so constructed. I entirely obviate these defects
by constructing the spring tubes of the said apparatus of tempered
copper, as I have found that this metal by reason of its toughness and
tenacity and non-liability to corrosion will stand more strain, and will
not burst so readily as the ordinary brass tubes. In making these
improved tubes I either "draw" them from solid copper or I braze
them, that is to say, I use either "solid drawn" tempered copper tubes
or "brazed" tempered copper tubes.
Having now described and particularly ascertained the nature of my
said Invention, and the manner in which the same is or may be used or
carried into effect, I would observe in conclusion that what I consider to
be novel and original, and therefore claim as the Invention secured to
me by the herein-before in part recited Letters Patent is, the manufac-
ture and use of pressure and vacuum gauges wherein the tubes aro
composed of toughened or tempered copper, substantially as and for the
purpose herein-before described; also the manufacture of the spring
tubes for pressure and vacuum gauges of tempered copper, as herein-
before described;
In witness whercof, I, the said Thomas William Westerby, have
hereunto set my hand and seal, this Third day of April, in the
year of our Lord One thousand eight hundred and seventy-
THOMAS W. WESTERBY. (L.S.)
Witness,
EDWIN P. ALEXANDER,
Consulting Engineer and Patent Agent,
14, Southampton Buildings,
Chancery Lane, W.O.