US854796A - Surveying instrument. - Google Patents

Description

116.854.796. l V PATBNTL'D MAY2s,'19ov.

- A. A. BRQTHBN.

SURVEYING INSTRUMENT.

APKIHLIOATION FILED PEB. 4, 1907.

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ANDREW A. BROTIIEN, OF MOIIN'IAIN HOME, IDAHO.

SURVEYING INSTRUMENT.

Specification of Letters latent.

Patented May 28, 1907.

Application iiled February 4, 1907. Serial No. 355,603.

T0 a/Zw/wnt 'llt 71u14/ concern:

Be it known that I, ANDREW A. BROTHEN, a citizen of the United States, residing at Mountain Home, in the county of Elmore and State of Idaho, have invented certain new and useful Improvements in Surveying Instruments; and I do hereby declare the following to be a full7 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 for its object to provide a simple and cheap surveying instrument, and to the above ends the invention consists of the novel devices and combinations of devices hereinafter described and deiined in the claims.

In the accompanying drawings which illustrate the invention, like characters indicate like parts throughout the several views.

Referring to the drawings, Figure 1 is a view in front elevation, with some parts broken away, showing the improved surveying instrument. Fig. 2 is a horizontal section taken on the line :t2 002 of Fig. 1. Fig. 3 is a detail view in side elevation, showing the so-called sighting bar and its pendulum. Fig. 4 is a section on the line x4 of Fig. 3; and Fig. 5 is a section on the line m5 of Fig. 3.

Preferably, the movable parts of the instrument are located` within a casing 1 that is rigidly secured to the upper end of a supporting base 2, the lower end of which latter is sharpened and adapted to be readily forced into the ground to support the casing l in an upright position. The casing lis provided near the upper portions of its Jront and rear walls with inset glass panes 3 and it is preferably provided with a hinged top 4.

A transverse spindle or axle 5 is secured at its ends to the sides of the casing l, with its intermediate portion in line with the two transparent panes 3. l Loosely pivoted on this spindle 5 is a so-called sighting bar 6 I that is provided at its centrallportion, towit, just below the spindle 5, with a depending weighted rod 7 that acts as a pendulum to maintain the sighting bar 6 in a horizontal position or at an angle to a horizontal, as will presently more clearly appear.

On one end, the sighting bar 6 is provided with a sight piece 8, shown as provided with a pointed intermediate sighting lug 8a. The other arm of the sighting bar 6 is provided with a long slot 6EL in which is located a threaded rod 9, the ends of which are swiveled to the said bar, and the extreme outer end of which is preferably provided with a thumb piece 9a, by means of which it may be turned. Working in the slot 6'L and having threaded engagement with the adjusting rod 9 is a sight block 10 which., as shown, is provided with an intermediate V-shaped sighting notch 10a.

The construction and arrangement of the parts described is such that when the sighting block 10 is adjusted approximately as shown in Fig. 3, the pendulum or weighted rod `7 will hold said sighting bar 6 in a horizontal position. When, however, the sighting block 10 is moved nearer to the fulcrum or pivot spindle 5 of the bar 6, the right hand end of said bar, as viewed in Fig. 3, will be lightened or over-balanced slightly by the left hand end ot said arm, so that the pendulum 7 will be swung slightly toward the right, and the right hand end of said sighting bar 6 will be slightly raised. It is thus evident that by proper adjustments of the sighting block 10 4the sighting bar 6 may be set at the roper angle to get a risingy or declining gra e. It is, oi course, evident that the sighting may be taken looking into either end of the casing. The sighting should, of course, be taken with the point of the sighting lug 8a alined with the point of the sightingnotch 10a. l l The obvious purpose of inclosing the parts of the instrument in the casing 1 is to protect the same from the elements, such as rain, dust and snow.

The instrument described is of very small cost and. may be used by all persons, whether or not they are skilled in the art of surveymg. It is especially adapted for use by persons not skilled in the art of surveying and was particularly designed for use by farmers and other in the irrigated sections of the country. It w ill enable them in the iirst instance and without experiment to accurately run their ditches and laterals so that they will carry W ater; and by its use the farmer or other person can also readily determine where his ground is improperly leveled and uniit for irrigation, and this without waiting, as has been customary, for a year, more or less, in order to see where water will flow and where it will not How. In this way, the Jfarmer may be insured a good crop the iirst year, on much ground which would, under the old practice,

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not have been productive because not properly leveled for irrigation. The instrument will also save farmers and others surveyors fees and, furthermore, will be at hand when needed.

What I claim is:

l. In an instrument of the kind described, the combination with a suitable support, of a weighted oscillatory sighting bar provided oii opposite sides ot its pivotal point of suspension with sighting pieces, one of which is adjust able longitudinally of said sighting bar to vary the inclination of said bar with respect to a horizontal, substantiallyT as described.

2. In an instrument ot the kind described, the combination with a suitable support having a depending leg or means for anchoring` the saine to the ground, oi' a weighted oscillatory sighting bar 6 interinediately pivoted to said support and provided at the end ot one ot its arms with a sighting piece S, the other arm thereof being slotted and provided with an adjusting screw, and an adjustable block l0 working in the slot of said bar having screw threaded engagement with said adjusting screw 9 and provided with a sighting piece 10, substantially as described.

3. The combination with the casing l having a depending supporting leg 2 and the opposite transparent panes 3, ot the sighting bar 6 intermediately pivoted within said casing and provided with a depending weighted pendulum 7, a sighting piece 8 secured te one end oi said sighting bar, the other arin ot said bar being slotted and provided wiih an adjusting screw 9, and a block l() working in the slot oi said bar, having screw threaded engagement with said. screw 9 and provided with a sighting piece 10"l substantially as described.

lii testimony whereof I aiiix my signature in. presence ot two witnesses.

ANDREV A. BROTHER'.

litnesses T. J. LA Fonns'r, C. (l. B'lonfrnnnn.

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