G. LUPFT.
ANBROID BAROMETBR.
AI’PLIOATION FILED JUNE 4, 1909.
983,916,
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Z??hcsses;
Patented Feb. 14, 1911.
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S’ 'Iâ ATFIÈNI‘ ÜFFI@E
GOTTHILF LUFFT, OF STUTTGART, GERMANY.
ANEROID BAROMETER.
983,916.
Speeíñeation of Letters Patent.
Patented ren. ia, ieri.
Application tiled .Tune 4, 1909. »- Serial No. 500,170.
'l'o ett whom it may concern:
Be it known that I, GorrHILr Lurr'r, a panying drawings, in which one form of
citizen of the German Empire, residing at construction is shown as an example.
Stuttgart, in the Kingdom of ldïürtemberg‘,
Figure l is a side elevation partly in sec
Empire of Germany, have invented certain tion of the barometer; Fig. 2, a plan view
new and useful Improvements in Aneroid partly in section; Fig'. 3, an axial section of
Barometers; and I do' hereby declare the both dials; Fig. 4l, an isometric view show
following to be a full, clear, and exact de
ing the two disks separated.
scription of the invention, such as will en
able others skilled in the art to which it ap
struction and provided with an indicator Ö,
pertains to make and use the same.
which moves over a scale from which the
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he barometer a, itself is of ordinary con-
This invention relates to an improvement height of the barometer can be ascertained
in the dials of metal barometers, the so in the ordinary way.
In order to adapt the barometer to the al
called aneroid barometers. IIitherto card
board, enamel, glass and the like were usu~ titude of the place where it is used, the dial
ally employed for these dials, which, how is made manually adjustable and consists of
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ever, involved various disadvantages. In two, preferably equally sized, disks c and
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moist- climates, such as that of England and (Z, the upper one of which is made of trans
others, cardboard dials warp and contract and parent, non-brittle light material, such as
have an ugly appearance. If these disks are Celluloid, gelatin foil or the like. The two
disks lie one upon the other and may be
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rotated independently of one another. One
tively displaceable, their movability is fre~ of the disks c (preferably the lower) car~
quently affected by the warping or distor ries the figures showing' the barometric pres
tion of the disks. In order to prevent this sure, while the other (Z contains the weather
enamel or glass dials are employed. These, indications. These two disks rest on a rigid
however, cannot be made displaceable as is foundation or support f in a g‘rooved ring
necessary for adjusting the barometer with e and are revolubly arranged in the flanged
reference to the normal pressure of the place edge of the latter. It will be understood
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mounted so as to be revoluble in one another,
that is to say are arranged so as to be rela
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at which it is used, on the one hand because
that, since the two disks rest on a rigid
the enamel dials are not adapted for this, support f, and are loosely held in the ring
and on the other hand because glass dials c, they can be revolved individually with
have been found too brittle. They are also perfect ease by merely grasping one or the
expensive to make and heavy, which again other of them. In Fig. 3 it is seen, however,
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is very deleterious to their sale and trans they rest upon the foundation f, which foun
portation. These drawbacks are removed by dation is _fast to the central ring e as also to
this invention. Its characteristic feature is the outer edge of the casing' a. As the disks
the provision of two superimposed mutually lie loose in the ring c, and are not attached
revoluble,
preferably uniformly sized, disks, to the case a, their capacity to revolve and be
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of which the upper t or if desired both disks) adjusted singly is evident.
I declare that what I claim is :`
consists of light, non-brittle, transparent
material, such as Celluloid, gelatin foil or
In an aneroid barometer, the combina
the like. The dial thus has the appearance tion with aA metal case containing the usual
of an enamel one and has also the advantage barometer mechanism, of a pair of revoluble
that it is conveniently revoluble without its disks arranged above said mechanism and
being' apparent that it is composed of two within the case, and carrying suitable in
parts. It is also much lighter in weig'ht and dicia, one disk being composed of trans
can be made much cheaper than enamel parent, light, non-brittle material and adapt
dials. On one of the two disks the air pres
sure figures are indicated, ou the other the
ed to cover the other disk, a. support in the
central portion of the case .for the disks hav
weather indications; the disks are revolubly ing a grooved ring in whose flanged edge
mounted in a metal case of the barometer
and coincide with one another, so that the
dial appears a single piece.
The invention will now be more particu
larly described with reference to the accom
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the disks are revolubly arranged, and suit~
able pointers connected with the barometer
mechanism.
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2. In an aneroid barometer, the combina~
tion with a metal case containing the usual llO
barometer mechanism, of a pair of disks ar
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983,916
ranged opposite to the said mechanism and the two disks and Within Wliicli they are 10
Within the case and having suitable indicia revoliibly arranged.
on their Íaces, one of the disks being trans-
In testimony whereof I affix my signature,
parent and revoluble in relation to tlie other in presence oi’ two Witnesses.
disk, and a rigid support in the Central portion of the case on which botli- disks are
located and are loosely retained by friction,
said support having a circular part provided with a flanged edge which receives
GOTTHILF I UFFT
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ÑVitnesses:
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JEAN GULDEN,
HERMANN Herrn.
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