An Improved Aneroid Barometer.
Year: 1893

page_text: Date of Application, 9th Mar., 1893
Complete Specification Left, 13th Nov., 1893-Accepted, 9th Mar., 1894
An Improved Aneroid Barometer.
I, ERNST BIEBISCH of 8 Acazien Street, Schöneberg, Germany, Engineer,
do hereby declare the nature of this invention to be as follows:-
The present invention relates to a contrivance at aneroid barometers, for operating
the indicator-shaft in its longitudinal direction, under the influence of the expanding
and contracting box, thus providing, that the thread or chain, which is wound
round the indicator-shaft, is always wound on or off in the same direction, so that
the indicator-shaft alway turns in proportion to the motion of the chain. Besides
this, there is an important improvement made for the simplification of the
manufacturing namely the box and the spring, on which the indicator-shaft-bearer
is supported, are fixed to the ground-plate by means of a single screw.
In the accompanying drawing
Fig. 1 is the section, and
Fig. 2 is the plan of a barometer arranged according to this invention.
The box A, and the support-spring B are fastened to the ground-plate by means
of the same screw C. The bearer of the indicator-shaft D is fastened to the
box A and is supported on the upper end of the spring B. The rod G fastened to
the spring B, stands in connection with the lever H on the shaft J. On the latter
there is also a lever F, the end of which is connected with the chain E which is
wound round the indicator-shaft. If-as shown by Fig. 3-the rod G shifts from
c to d, that point of the indicator-shaft on which the chain is wound-descends
from a to b. The chain having so far been wound off in the direction a a', is now
wound off in the direction b. These directions are parallel, so that the winding-
off always remains uniform. But if the indicator-shaft were not following' the
motion of the box, the winding-off of the chain, in the said position, would take
place in the direction a 6' and would therefore not be proceeding uniformly.
Dated this 7th day of March 1893.
ERNST BIEBISCH.
COMPLETE SPECIFICATION.
An Improved Aneroid Barometer.
1, ERNST BIEBISCH of 8 Acazien Strasse, Schöneberg, Germany, Engineer,
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:-
The present invention relates to a contrivance in connection with aneroid
barometers, for moving or shifting the indicator shaft in the direction of its length,
under the influence of the expanding and contracting box, thus attaining, that the
thread or chain, which is wound round the indicator shaft, is always wound on or
off in the same direction, so that the indicator shaft always turns in proportion to
the motion of the chain.
Besides this, there is an important improvement made for the simplification of
the manufacture, namely the said box and the spring, which supports the bearing
of the indicator shaft, are fixed to the ground plate by means of the same screw.

page_text: Referring to the accompanying drawing,
Fig. 1 is a section,
Fig. 2 a plan, and
Fig. 4 a side view of a barometer arranged according to this invention.
Fig. 3 is a diagram indicating its action.
The well known expanding or contracting case or box A, and the supporting
spring B are fastened to the ground-plate by means of the same screw C. This
spring B is under the influence of an adjusting screw K, serving to adjust the
instrument for the various heights above the sea-level.
The support D of the indicator shaft is fastened to the box A and rests on
the upper end of the spring B. The rod G fastened at one end to spring B is
connected at the other end with a link H which is secured to a short arm / fixed on
the shaft J. On the latter is also mounted a lever F, the end of which is connected
with the chain E wound round the indicator shaft, d is an antagonistic spring
acting on the indicator shaft. If as indicated by the diagram Fig. 3, the rod G
is moved from c to d, that point of the indicator shaft, on which the chain is
wound, descends from a to b. The chain having so far been wound off in the
direction a a', is now wound off in the direction bb. These directions are parallel,
so that the winding off always remains uniform. But if the indicator shaft were
not following the motion of the box, the winding off of the chain, in the said
position, would take place in the direction a b¹ and would therefore not proceed
uniformly.
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 ;-
1. An aneroid barometer having an indicator axle so connected with the
expansible box (A) as to rise and fall with the movements of the latter,
substantially as described and for the purpose specified.
2. In a barometer of the type described, the expansible case (A) and spindle
supporting spring B fixed or adapted to be fixed to the base plate by the same
screw, substantially as described.
Dated this 10th day of November 1893.
ERNST BIEBISCH,
By Fairfax & Wetter,
433, Strand, London, Agents.