G. LUPFT. ANBROID BAROMETBR. AI’PLIOATION FILED JUNE 4, 1909. 983,916, i) ' Z??hcsses; Patented Feb. 14, 1911. ” ITE S’ 'Iâ ATFIÈNI‘ Ü[email protected] 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 60 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 70 ever, involved various disadvantages. In two, preferably equally sized, disks c and 20 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 75 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 80 mounted so as to be revoluble in one another, that is to say are arranged so as to be rela 25 30 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, 35 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 40 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 85 90 100 105 the disks are revolubly arranged, and suit~ able pointers connected with the barometer mechanism. ` 2. In an aneroid barometer, the combina~ tion with a metal case containing the usual llO barometer mechanism, of a pair of disks ar ’2 983,916 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 _ J ÑVitnesses: - JEAN GULDEN, HERMANN Herrn. '
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