US 546501 A
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T.r ZANGER. vMAGNETICI'ENDULUM LEVEL,
' No. 546,501.. F5941. Patented Sept. 1'7, `1895.
Nrrnn STATES THEODOR ZANGER, OF ERIE, PENNSYLVANIA, ASSIGNOR TO JACOB W. SEIP,
OF SAME PLACE.
SPECIFICATION forming part of Letters Patent No. 546,501, dated September 17, 1895. Application filed October 28, 1898. Renewed June 6, 1895. Serial No. 551,790. (No model.)
drawings, and to the letters of reference marked thereon, which form a part of this specification.
My invention relates to improvements in magnetic pendulum-levels; and the object of the invention is to produce a pendulum-level that is always reliable and will denote the eX- act degrees on an accurately-divided dial and in such manner that the vibrations or trembling of the pointer usually occurring with the ordinary pendulum-levels is entirely obviated or prevented; also, to accomplish this by Very simple devices that are not liable to get out of order, but will always accurately designate the level-line; furthermore, to attach the weighted pendulum and the pointer on a pin or shaft, having at each end a needlepoint, which points are journaled in corre? sponding journals drilled into the glass front and back so as not only to make the pointer very sensitive, but also to form a Very hard and durable bearing-surface, and, finally, to produce this magnetic pendululn-level at a very reasonable expense.
My invention consists in the construction of certain peculiar details and arrangement of parts, as will be more fully described hereinafter, and speciiically pointed out in the claims, reference being had to the accompanying drawings and the letters marked thereon.
Like letters ,indicate similar parts in both figures of the drawings, in which- Figure l represents a sectional elevation of my improved magnetic pendulum-level. Fig. 2 is a horizontal section on the line 2 2 of Fig. 1.
In the drawings, A represents the body or stock of the level, preferably made of metal, although it may be made ot' wood or any other suitable material, and it may be plain or ornamental, as desired. This stock is provided with a short cylinder or casing B, having at each end a screw-thread to receive the heads C and D, provided with flanges to receive lglass plates or disks E and F, and forming the pendulum G, having a convex face, is also provided with a piece of similar thin magnetized steel g forming its face, and it is arranged as close as possible to the projection b and its liner, so as to be attracted by it. This pendulum is secured to a pinY or short shaft h, having a needle-point at each end, and said needle-points are journaled in small depressions of similar shape to receive said needlepoints. The depressions are drilled or ground into the glass plates E and F, thus forming very` accurate and hard bearings for the needle-points. To the shaft h the pointer or index H is secured, being, as shown, double pointed, and if paper or equivalent dials are used it must be placed in front of them. It will be readily understood that by magnetizing the steel liners the action of the pendulum and pointer will be very steady and all vibrations will be entirely obviated, and levels of any kind can be accurately ascertained and noted.
Having thus described my invention, what I claim is 1. In a magnetic pendulum level the combination of a cylinder having a magnetic liner, and the glass front and back, with a shaft provided with needle-points journaled in'said glass front and back, and a pendulum with magnetized face and a pointer secured to said having magnetized face and the pointer II, shaft, all arranged as specified. all constructed and operating as specified. Io 2. The magnetic pendulum level herein de- In testimony whereof I affix my signature scribed, consisting of the stock A having the in presence of two Witnesses. cylinder B provided with magnetic inner sur- THEODOR ZANGER. face, attached to it, and having a glass front XVitnesses:
and back, in which the needle-pointed shaft I. F. VVALLIIER, 7L is jouinaled, and carrying the pendulum G T. C. BRECHT.