Improvements in Capillary Manometers.
Year: 1894

page_text: Date of Application, 18th Oct., 1894-Accepted, 24th Nov., 1894
COMPLETE SPECIFICATION.
Improvements in Capillary Manometers.
I, OTTO STEINLE, of Quedlinburg, in the Province of Saxony, German Empire,
Manufacturer, do hereby declare the nature of this invention, and in what manner
the same is to be performed, to be particularly described and ascertained in and
by the following statement:-
Hitherto it has not been possible to employ the coiled capillary tubes filled with
mercury-such as are known in thermometers-in manometers, as the steam on
pressing the mercury into the capillary channel would itself enter the latter, and
would introduce dirt into, or cause rusting of, the said channel.
The object of my invention, therefore, is to obviate the said disadvantages,
which I attain by combining with the manometer proper a small reservoir
containing mercury, and having such a position, that the steam can only press upon
the surface of the mercury within said reservoir without being able to enter the
capillary channel of the coiled tube.
In order to make my invention more clear, I refer to the accompanying drawing,
in which:
Fig. 1 is an elevation of my improved manometer,
Fig. 2 is a sectional view of the same.
Fig. 3 is an elevation of a slightly modified manometer,
Fig. 4 is a sectional view of the same.
Fig. 5 is an elevation of another modification, and
Fig. 6 is a sectional view of the latter.
Similar letters denote similar parts throughout the different views.
Referring to Figs. 1 & 2, a is the capillary coiled tube arranged within the well
known gauge-case p, and having at its closed outer end a¹ the hand b rivetted
thereon; is the scale.
The inner end of the capillary channel terminates in a plug 9 having a central
bore a communicating with the reservoir c through the hole a. The steam enters
the manometer through the channel d.
The reservoir c is filled with mercury to such a height only, that the mouth of
channel d is always above the level of the mercury. The mercury is entirely
prevented from entering said channel, even if the manometer during transport is
inclined.
It will be seen, that the steam can press upon the surface only of the mercury
within the reservoir c, without being able to enter the channel of the coiled capillary
tube.
The
In Figs. 3 & 4, the above described arrangement is essentially the same.
To the closed end a¹ of
hand b, however, is not directly attached to the tube a.
the tube attached, by means of a joint, the rod e, the other end of which is
connected by a joint with the piece f, which latter is adapted to be displaced along
the rod h. The set-screw k serves for fixing piece f upon the rod . The latter is
pivotted at and is furnished with a toothed sector n gearing with a small
toothed wheel m rigidly attached to the hand b, or to the shaft of the same
respectively.
In Figs. 5 & 6 the rod e is hinged to a piece t fixed upon the spindle n¹ by means
The spindle n' carries the hand b.
5 of the set-screw 0.

page_text: Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
In a manometer, the combination with a coiled capillary tube filled with mercury,
of a mercury reservoir constantly communicating with said tube, the mercury
contained within said reservoir being adapted to receive, and to transmit, the
pressure of the steam, for the purpose as described.
Dated this 18th day of October 1894.
OTTO STEINLE,
By T. E. Halford,
Agent for the Applicant.