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Patents: 391 of 530	UNITED STATES PATENT OFFICE. OLIN H. BASQUIN, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE LUXFER PRISM PATENTS COMPANY, OF SAME PLACE.	Olin H. Basquin 26 of 28
ANGLE-MEASURING DEVICE. SPECIFICATION forming part of Letter Patent No. 595,260, dated December 7, 1897. Application filed February 9, 1897. Serial No. 622,648. (No model.)

To all whom it may concern:     Be it known that I, OLIN H. BASQUIN, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Angle-Measuring Devices, of which the following is a specification.     My invention relates to angle-measuring devices, and has for its object to provide a new and improved device for measuring angles, of which the following is a description, reference being had to the accompanying drawings, wherein—     Figure 1 shows a side view of an angle-measuring device embodying my invention. Fig. 2 shows a modified form of angle-measuring device.     Like letters refer to like parts throughout both figures.     My present invention is particularly adapted to be used in connection with prismatic lights.     When windows are provided with prismatic lights, the dimensions or angles of the prisms depend upon the angle at which the rays of light strike the window and upon the angle at which it is desired to have them leave the window. In cities or other places where there are high buildings the buildings on one side of the street shut off a portion of the light which would otherwise fall upon the windows on the opposite side of the street. The angles of the prisms to be used in any given window, when the angle at which the light leaves the prisms in the window is known, may be ascertained if the angle at the window from the horizon, subtended by the building or other obstacle which cuts off the lower light, is known. The object of my invention is to provide an angle-measuring device by which this angle can be easily and quickly ascertained.     Referring now to Fig. 1 of the drawings, a sighting device or telescope A is provided with a graduated scale or arc B, movably connected thereto, as by being pivoted at B'. This arc is provided with a projection B². A spring B³ is interposed between the telescope and the projection B² and tends normally to force said projection away from the telescope. An arm

C is pivotally connected to the telescope and is provided at its end with the indicating device C', adapted to swing along the arc B, the arm acting as a plumb-line.     The angle-measuring device is preferably used without a support, but it may be placed on any desired support— as, for example, the support D.     In Fig. 2 I have indicated a modified form of my device. In this construction the graduated arc B is provided with the projecting arms B4, which meet at the center of the circle of which the gradated arc is a portion, the whole being pivoted at B5 to the pieces or arm D, having at its outer end the projection or sight D'. An arm D² is placed at an angle to the arm D and is provided with the point or sight D³. A pointer C' is attached to the arm D and is adapted to indicate the angle on the graduated arc B. The arm D² is preferably pivotally connected to the arm D or to some part connected therewith. As shown in the drawings, said arm is provided with a pin D4, which projects through a slot D5, the whole arranged so that the arm D² may be folded up when not in use. The sights D' and D² may be so formed that a telescope may be placed thereon, as shown in dotted lines. This device is preferably used without a telescope.     I have shown two forms of my device in order to more clearly illustrated my invention; but it is evident that other constructions than the ones herein shown may be used to obtain the result desired, and I therefore do not wish to be limited in any particular to the construction shown.     The use and operation of my invention are as follows:     Referring to Fig. 1, the graduated arc B is normally forced against the swinging arm C by the spring B³, thereby preventing the arm from moving. When it is desired to ascertain the angle from the horizon subtended by any object— as, for example, a building— the telescope is pointed at the top of the building and the graduated arc is moved by an upward pressure of the projection B², so as to free the arm C, which acts as a plumb-line and moves along the graduated arc, its position depending upon the angular position