IMPROVEMENTS IN STEAM, VACUUM, AND HYDRAULIC GAUGES
Year: 1872

page_text: LETTERS PATENT to Alphonse Lafargue, of No. 7, York Terrace,
Acklam Road, Notting Hill, in the County of Middlesex, Engineer,
for the Invention of "IMPROVEMENTS IN STEAM, VACUUM, AND HYDRAULIC
GAUGES."
Sealed the 4th March 1873, and dated the 9th September 1872.
PROVISIONAL SPECIFICATION left by the said Alphonse Lafargue
at the Office of the Commissioners of Patents, with his Petition,
on the 9th September 1872.
I, ALPHONSE LAFARGUE, of No. 7, York Terrace, Acklam Road,
Notting Hill, in the County of Middlesex, Engineer, do hereby declare
the nature of the said Invention for "IMPROVEMENTS IN STEAM, VACUUM,
AND HYDRAULIC GAUGES," to be as follows:-
First. To the Bourdon and such like pressure or vacuum gauges, and
consists in forming the working axis of German or nickel silver in place
of brass or steel, by which corrosion is avoided. The spring or expansion

page_text: tube from which the indication is obtained I also form of two tubes, one
within the other, from the like German or nickel silver.
Secondly. My object is to prevent the indications on the dials being
defaced and the dials from cracking or chipping, as is the case in the
ordinary painted iron dials when exposed to a great heat from the furnace 5
or to the immediate action of the steam or weather. For this purpose I
employ solid porcelain enamelled dials subjected to the process of
firing at a high temperature, thereby baking the figures into the solid
enamel and securing their permanency..
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Alphonse Lafargue in the Great Seal Patent Office
on the 8th March 1873.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, ALPHONSE
LAFARGUE, of No. 7, York Terrace, Acklam Road, Notting Hill, in the
County of Middlesex, Engineer, send greeting..
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent; bearing date the Ninth 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 suc-
cessors, give and grant unto me, the said Alphonse Lafargue, Her
special license that I, the said Alphonse Lafargue, my executors,
administrators, and assigns, or such others as I, the said Alphonse
Lafargue, 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
IMPROVEMENTS IN STEAM, VACUUM, AND HYDRAULIC GAUGES," upon the con-
dition (amongst others) that I, the said Alphonse Lafargue, 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.-

page_text: claim is,-
First. The forming the working axes of Bourdon or such like pressure
or vacuum gauges, and the spring tubes of such gauges of German or
nickel silver.
Secondly. I claim the forming the dials of steam, vacuum, and
hydraulic gauges of solid porcelain as described.
In witness whereof, I, the said Alphonse Lefargue, have hereunto
set my hand and seal, this Seventh day of March, in the year
of our Lord One thousand eight hundred and seventy-three.
ALPHONSE LAFARGUE. (L.S.)