US 879122 A
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Description (OCR text may contain errors)
G. N. SABGMULLER.
LEVEL. APPLICATION FILED AUG. 26, 1907.
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PATENTED FEB. 11, 1908.
' PATENTED FEB. 11, 1908.
. G.. N. SAEGMULLER.
APPLIOATION IILED AUG. as, 1907.
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UNITED STATES PATENT OFFICE.
GEORGE N. SAEGMULLER, OF ROCHESTER, NEW YORK, ASSIGNOR TO BAUSOH, LOMB, SAEGMULLER (10., OF ROCHESTER, NEW YORK.
Specification of Letters Patent.
Patented Feb. 1 1, 1908'.
Application filed August 26, 1907. Serial No. 390,194-
To all whom it may concern:
Be it known that I, GEORGE N. SAEG- MULLER, a citizen of the United States, residing at Rochester, in the county of Monroe and State of New York, have invented certain new and useful Improvements in Levels, of which the following is a specification.
The object of the present invention is to provide a novel, simple and effective level, whereby the necessity of a double record, one kept by the rod-man, the other by the opera tor of the instrument is unnecessary, and the latter can keep the complete record, thus materially reducing the liability of making errors.
The preferred embodiment of the invention is illustrated in the accompanying drawings, wherein Figure 1 is a side elevation of the level. Fig. 2 is an end elevation of the same. Fig. 3 is a cross sectional view. Fig. 4 is a longitudinal sectional view through the spirit level. Fig. 5 is a plan view of the same with the cover removed. Fig. 6 is a detail sec tional view showing means for securing the reflector in adjusted position.
Similar reference numerals designate corresponding parts in all the figures of the drawings.
In the embodiment illustrated, the usual supporting means for the level is employed, and is described as a whole by the reference numeral 8. This supporting means includes a pair of spaced brackets 9 vertically adjustable by a screw 10, and carrying a telescope 11, which may be of any desired character. This telescope includes an eye piece 12, and has cross hairs 13 located in the field of vision, as well known to those skilled in this art.
Secured to one side of the telescope tube 11 is a casing 14 having an open top, and in this casing is located a spirit level 15 having the usual bubble 16 that is movable longitudinally of the telescope. The bubble cooperates with a scale 17, which may be formed directly, upon the tube or upon a cover glass therefor. A cover 18 for the casing is pivoted, as shown at 19 to the rear end of said casing, and is adapted to be fitted in an inclined position by any suitable means, as for instance, a clamping nut 20 threaded on to the pivot and bearing against the adjacent pivot ears of the cover. This cover carries on its inner side a reflector 21 which may be of any desired construction, though preferably an ordinary mirror. In actual practice, and in order that the mirror and cover may not shade the spirit level any more than necessary, the pivoted end ofthe cover is preferably open, as shown at 22.
The instrument is used substantially as follows. The cover 18 is elevated so that the mirror 21 is disposed at an inclination in the field of vision of the operator in order that he may, while sighting through the telescope with one eye be able to clearly see reflected in said mirror the bubble of the spirit level and the scale. The level is thereupon sighted upon a target in the ordinary manner, the rodman adjusting said target on the rod to approximately the proper height. The operator of the instrument thereupon by adjusting the rear screw 10, brings the cross hairs 13 of the telescope into exact alinement with the mark on the target, and at the instant said mark and cross hairs coincide, he glances at the reflector 21, and reads therein the position of the bubble 16 with respect to the scale, thereupon making records of the position of the target and of the degree of inclination of the level. As a result, one person can keep the entire record, avoiding the necessity of the rodman making records and thereby eliminating to a very material degree the danger of mistakes. The instrument as thus constructed is very inexpensive,
and is'entirely practicable for the purpose set forth. It will of course be understood that the level and associated mechanism may be placed on either side of the telescope barrel, the reflector being arranged so that it is with in the field of vision of the eye of the operator that is not employed in sighting through the telescope.
From the foregoing, it is thought that the construction, operation, and many advantages of the herein described invention will be apparent to those skilled in the art, without further description, and it will be under stood that various changes in the size, shape, proportion, and minor details of construction. may be resorted to without (:leparting from the spirit or sacrificing any of the advantages of the invention.
Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is
1. In an instrument of the character set forth, the combination with a telescope having cross hairs therein, of a support for the telescope including means for tilting it in a vertical direction, a level mounted at one side of the telescope out of vertical alinement therewith and adjustable with said telescope, and a reflector associated with the level and disposed out of vertical alinement with the telescope, said level being located in the range of vision of one eye of the user of said telescope when the other eye is employed in sighting through the telescope.
2. In an instrument of the character set forth, the combination with a telescope, of a support for the telescope including means for tilting it in a vertical direction, a casing connected to one side of the telescope and adjustable therewith, said casing having an open top and being disposed out of vertical GEORGE N. SAEGMULLER.
H. C. TI-IoN, W. MUTH.