IMPROVEMENTS. IN ILLUMINATED PRESSURE AND VACUUM. GUAGES
Year: 1874

page_text: LETTERS PATENT to Arnold Budenberg, of the City of Manchester,
-Engineer, for the Invention of "IMPROVEMENTS. IN ILLUMINATED
PRESSURE AND VACUUM. GUAGES."-A .communication from abroad by
Bernhard August Schäffer and Christian Frederick Budenberg, of
Buckau, Magdeburg, in the Empire of Germany.
Scaled the 22nd January 1875, and dated the 28th July 1874.
PROVISIONAL SPECIFICATION left by the said Arnold Budenberg at
the Office of the Commissioners of Patents, with his Petition, on
the 28th July 1874.
I, ARNOLD BUDENBERG, of the City of Manchester, Engineer, do
hereby declare the nature of the said Invention for "IMPROVEMENTS IN
ILLUMINATED PRESSURE AND VACUUM GUAGES," to be as follows, a commu-
nication"
In constructing illuminated steam, pressure, vacuum, and other
guages, it has hitherto been customary to place the illuminating
medium within the dial case containing the mechanism for actuating
"

page_text: the index finger, and this has not only had a tendency to coat the dial
on the inner side with soot, which materially interferes with the trans-
parency of such dial, but the great heat is also liable to affect the
delicate mechanism.
Now according to this Invention an illuminated steam or other guage
is constructed with a transparent back as well as a transparent dial, and
the illuminating medium is placed in a suitable compartment at tho
back of and outside the guage, by which means the dial is protected from
being coated as herein-before described, and the heat is preventing
entering the dial case. This method of construction permits the guage
and illuminating compartment being made distinct and separate from
one another, whereby the cost of production is not only materially
decreased, but the guage itself may be sold apart from the illuminating
compartment.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Arnold Budenberg in the Great Scal Patent Office
on the 28th January 1875.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, ARNOLD
BUDENBERG, of the City of Manchester, Engineer, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Twenty-eighth day of July, in the
year of our Lord One thousand cight hundred and seventy-four, in
the thirty-seventh year of Her reign, did, for Herself, Her heirs and
successors, give and grant unto me, the said Arnold Budenberg,
Her special licence that I, the said Arnold Budenberg, my executors,
administrators, and assigns, or such others as I, the said Arnold
Budenberg, my executors, administrators, and assigns, should at any
timo 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 ILLUMINATED PRESSURE AND VACUUM
GUAGES," (a communication to him from abroad by Bernhard August
Schäffer and Christian Frederick Budenberg, of Buckau, Magdeburg, in

page_text: the Empire of Germany, upon the condition (amongst others) that I,
the said Arnold Budenberg, my exccutors or administrators, by an instru-
ment 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 samo
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 Arnold Budenberg, do hereby declare
the nature of the said Invention, and in what manner the samo is
to be performed, to be particularly described and ascertained in and by
the following statement :-
In constructing illuminated steam, pressure, vacuum, and other
gaugos it has hitherto been customary to place the illuminating medium
within the dial case containing the mechanism for actuating the index
finger, and this has not only had a tendency to coat the dial on the
inner side with soot, which materially interferes with the transparency
of such dial, but the great heat is also liable to affect the delicato
mechanism.
Now according to this Invention an illuminated steam or other gaugo
is constructed with a transparent back as well as a transparent dial, and
the illuminating medium is placed in a suitable compartment at the
back of and outside the gauge, by which means the dial is protected
from being coated as herein-before described, and the heat is prevented
entering the dial caso. This method of construction permits the gauge
and illuminated compartment being made distinct and separate from
one another, whereby the cost of production is not only materially
decreased, but the gauge itself may be sold apart from the illuminating
compartment.
And in order that tho said Invention may be the more readily under-
stood and carried into practical effect, I have hereunto annexed a
Drawing illustrating a steam gauge constructed according to this
Invention, similar letters marked on the several views being used to
denote similar parts.
Fig. 1 is a front view; Fig. 2, a cross section; and Fig. 3 is a front
à sectional view of Fig. 2 on the line a—b, with the dial and index finger

page_text: . In all the views A is the dial case containing the indicating mochan-
ism B, which contains no feature of novelty, and forms no part of the
present application, but is simply shown as one method of arranging the
mechanism so as to cast as small a shadow as possible upon the semi-
transparent porcelain dial C. This dial caso is constructed with tho
usual glass plato D in front, and at the rear a similar transparent glass
plate E is employed instead of tho usual metallic back. This glass back-
is introduced from the rear, and is shown secured in position by a metallic
wire F bedded in cement or putty, although I do not confine myself to
this method of securing such glass plate.
It will thus be apparent that the Invention as so far described only differs
from the ordinary gauges in having a semi-transparent dial and a trans-
parent glass back, and that although I have not described the application
of my improvement to a Bourdon gauge that they are equally applicable
to that as well as other description of gauges, care being takon to 1
arrange the internal mechanism in such a manner as to cast as littlo
shadow as possible upon the back of the semi-transparent dial.
:
I will now proceed to describe the compartment for containing. the
illuminating medium, which is by preference constructed of sheet metal,
and consists of a casing G made separate from the dial case A herein- 2
before described, and is attached thereto by being made of just sufficiont
diameter to slide over the rear of such dial caso far enough to be secured
thereupon by the screws H. This illuminating compartment is provided
with the ordinary construction of lantern cover or chimney I, and with
the air inlet or perforations J. A door K is also provided (shewn dotted 2
in Fig. 2) which turns upon the hinge L in order to obtain access to the
interior of the illuminating compartment, either for lighting the oil
lamp M, or to withdraw or introduce the same, such door being secured
when closed by the ordinary thumb latch N.
.
Instead of using the oil lamp M it will be readily apparent that a gas 3
jet or other illuminating agent may bo substituted.
Having thus particularly described and ascertained the nature of this
my said Invention, together with the best methods with which I am
acquainted for carrying the same into practical effect, I wish it to bo
distinctly understood that I do not confine myself to the precise details, 3
relativo porportions, or dimensions herein-before described and illustrated
on the accompanying Drawing, as the same may be considerably varied

page_text: without departing from the Invention, but what I claim is, the construc-
tion of steam, pressure, vacuum, and other gauges with a transparent
back, and the use and application of an illuminating compartment fixed
at the back of such gauges when constructed substantially as and for
the purpose herein-before described and illustrated on the accompanying
Drawing.
In witness whereof, I, the said Arnold Budenberg, have here-
unto set my hand and scal, this Twenty-seventh day of January,
in the year of our Lord One thousand eight hundred and seventy-
five.