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595,260 · Basquin · "Angle-Measuring Device" · Page 2 Home  > Prism Glass  > Patent Index  > Page 2

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of the telescope. After the telescope has been directed toward the top of the object the graduated arc is allowed to move, so as to engage the swinging arm C and prevent its further movement. The instrument may then be lowered and the desired angle read from the graduated arc, the pointer C' indicating such angle.     When the device shown in Fig. 2 is used, the line of sight is obtained by the two sights D' and D³. As the arm D is moved the arc B swings around its pivotal point, and when the sights are directed at the top of the object the angle from the horizon subtended by the object will be indicated upon the arc B by the pointer C'.     It will be seen that I have here an angle-measuring device which can be used by any

one and which needs no careful adjustment in order to correctly measure the angle.     I claim—     An angle-measuring device comprising a frame, a sighting device pivoted on such frame, an arc-shaped scale pivoted on such frame, a spring device associated therewith tending to move the arc-shaped scale toward the sighting device, a pointer pivoted on the sighting device and substantially equal in length to the distance between the pivotal connections of such pointer and scale with the sighting device, substantially as shown and described. OLIN H. BASQUIN. Witnesses:     DONALD M. CARTER,     BERTHA C. SIMS.