US448081A

US448081A - saeamuller

Info

Publication number: US448081A
Authority: US
Publication date: 1891-03-10
Anticipated expiration: 1908-03-10

Description

(No Model.)

G. N. SAEG-MULLER. EQUATORIAL MOUNTING.

Patented Man 10, 1891.

qwitmeooeo UNITED STATES PATENT OFFICE.

GEORGE N. SAEGMULLER, OF lVASI-IINGTON, DISTRICT OF COLUMBIA.

EQUATORIAL MOUNTING.

SPECIFICATION forming part of Letters Patent No. 448,081, dated March 10, 1891.

' Application filed November 17,1890- Serial No. 371,725. (No model.)

To coll whom it nutty concern.-

Be it known that I, GEORGE N1 SAEGMUL- LER, a citizen of the United States, residing at lVashington, in the District of Columbia, have invented certain new and useful Improvements in Equatorial Mountings; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention has relation generally to the manner of mounting equatorial instruments, and particularly to that part which supports the polar axis outside of the head-stock. light instruments of this kind it has been customary to support the instrument at this point by a single wheel having a round or are shaped periphery, so as to reduce the bearin g-surface to the minimum. Such a device would soon be flattened in a very irregular manner by a large instrument and the efiiciency of the latter partly, if not wholly, de-

stroyed. A single wheel with a broader bearing-surface would not answer as a substitute for the rounded wheel, for the reason that, while the bearing-face of the collar would be on substantially the same horizontal plane as the top of the wheel, the axis of the collar would be at an angle to the wheel, and consequently that part of the collar having the greatest diameter would be moving faster than that part having the smallest diameter, and thereby causing the parts to cramp the bearing and twist the instrument to a greater or less extent out of the position necessary for accurate observations. To remove all objections of this kind is the object. of my invention, and the object is accomplished by providing a series of thin wheels of the same diameter and mounted loosely upon the same shaft placed parallel with the bearing-face of the collar which rests on the wheelsas a bearing for said collar.

The invention therefore consists of construct-ions and combinations, all as will hereinafter be set forth in the specification and pointed out in the claim, reference being had to the accompanying drawing, in which the figure represents an elevation, partly in section, of a head-stock, its supporting-base, and

steel and'secured to or formed integral with the polar axis, and A friction wheels or rollers arranged in a frame a which is forced upward by any desired means, such as a spring or screw, the latter being shown in the present instance and marked or. The collar a is so beveled that that portion which contacts with the wheels or rollers A will be on a horizontal plane, that relation being retained no matter at whatinclination the polar axis maybe set because of the particular latitude in which the instrument is to be set up or placed. 7

The wheels or rollers A are of the same diameter and loose upon the same axle a so that each will be free to revolve independ ently of each other, so that when in contact with the beveled face a of the collar each wheel will be free to revolve in accordance with the movement of that part of the beveled face it is in contact with and irrespective of the movement of its adjoining wheel or wheels, which may be two or more.

lVhat I claim as new is In an equatorial instrument, the combination of the polar axis having a collar with horizontal bearingface anda series of wheels or rollers mounted upon a single shaft and supporting the polar axis by contacting with the beveled face of said collar.

In testimony whereof I affix my signature in presence of two witnesses.

GEORGE N. SAEGMULLER. \Vitnesses:

GEO. R. BYINGTON, M. F. IIALLEOIL.