CERTAIN IMPROVEMENTS IN BAROMETERS
Year: 1857

page_text: LETTERS PATENT to William Henry Thornthwaite, of Nos. 121, 122,
and 128, Newgate Street, in the City of London, for the Invention
of "CERTAIN IMPROVEMENTS IN BAROMETERS."
Sealed the 25th August 1857, and dated the 27th February 1857.
PROVISIONAL SPECIFICATION left by the said William Henry Thorn-
thwaite at the Office of the Commissioners of Patents, with his Petition,
on the 27th February 1857.
I, WILLIAM HENRY THORNTHWAITE, of Nos. 121, 122, and 128, Newgate
Street, in the City of London, do hereby declare the nature of the said In-
vention for "CERTAIN IMPROVEMENTS IN BAROMETERS," to be as follows:-
This Invention consists, firstly, in making barometer tubes, or that portion
thereof employed for observation, with a flattened bore instead of the ordinary
circular one, for the purpose of facilitating the reading.
Secondly, in employing a coating or covering of enamel on one side of the
glass tubes of barometers, in the manufacture thereof.
Thirdly, in graduating or marking divisions upon the glass tubes of baro-
meters in.lieu of or in addition to the ordinary graduations which are upon the
stand, to which the glass tube of the barometer is affixed.
Fourthly, in an improved mode of registering the rise and fall of barometers
by introducing smaller tubes with the main tube in the process of their manu-
facture.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said William Henry Thornthwaite. in. the. Great Seal Patent Office
on the 27th August 1857.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, WILLIAM
HENRY THORNTHWAITE, of Nos. 121, 122, and 123, Newgate Street, in the
City of London, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Twenty-seventh day of February, in the year of our
Lord One thousand eight hundred and fifty-seven, in the twentieth year of
Her reign, did, for Herself, Her heirs and successors, give and grant unto me,
the said William Henry Thornthwaite, Her special license that I, tho said
William Henry Thornthwaite, my executors, administrators, and assigns, or such
others as I, the said William Henry Thornthwaite, 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 King-
dom of Great Britain and Ireland, the Channel Islands, and Isle of Man, an
Invention for "CERTAIN IMPROVEMENTS IN BAROMETERS," upon the condition
(amongst others) that I, the said William Henry Thornthwaite, 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 the said Letters.
Patent.
NOW KNOW YE, that I, the said William Henry Thornthwaite, do hereby
declare the nature of the said Invention, and in what manner the same is to
be performed, to be particularly described and ascertained in and by the
following statement thereof, that is to say:-
My Invention consists, firstly, in making barometer tubes, or that portion
thereof employed for observation, with a flattened bore instead of the ordinary
circular one, for the purpose of facilitating the reading.
Secondly, in employing a coating or covering of enamel on one side of the
glass tubes of barometers; or the enamel may be incorporated or inserted in
the substance of the glass during its manufacture.
Thirdly, in graduating or marking divisions upon flattened glass tubes of
barometers in lieu of or in addition to the ordinary graduations which are
upon the stand, to which the glass tube-of the- barometer is affixed.

page_text: Having now described the nature and object of my said Invention of certain
improvements in barometers, together with the best means I am acquainted
with for carrying the same into practical effect, I hereby declare my Invention
to consist in and I claim,-
First, making barometer tubes with a flattened bore.
And secondly, combining enamel with the glass in the manufacture of the
glass tubes of barometers, as above stated.
In witness whereof, I, the said William Henry Thornthwaite, have here-
unto set my hand and seal, this Twenty-seventh day of August, in the
year of our Lord One thousand eight hundred and fifty-seven.
Witness,
ALEX. PRINCE,
Agent for Patents.
W. H. THORNTHWAITE. (L.S.)