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586,215 · Basquin · "Testing Device" · Page 2 Home  > Prism Glass  > Patent Index  > Page 2

586,215: 2 of 4

used, the prisms may be used in connection with the testing-frame or they may be placed at the window, the observer standing back at the point where the light is to be directed and picking out the proper prism.     I claim—     1. A testing device comprising a series of prisms of various angles connected together and adapted to be mounted in a testing-frame, provided with two openings, said prisms interposed between the openings in the testing-frame.     2. A testing device comprising a testing-frame provided with two openings, a series of prisms of varying angles, connected together and removably mounted in said testing-frame between said openings, said prisms adapted when held between the eye of the observer and a given window to indicate the proper prism to be used in order to best direct the light toward the point where the observer stands.     3. A testing device, comprising a series of prisms of various angles connected together and adapted to be interposed between the eye and the window or opening through which the light is admitted, said testing device adapted to indicate the proper prism to be used in said opening.

4. A testing device comprising a series of prisms of various angles connected together and adapted to be mounted in a testing-frame provided with two openings so as to be interposed between said openings, the angles of said prisms gradually increasing from one end of the series to the other, the whole mounted so that when held up between the observer's eye and the window or opening through which the light is admitted, the proper prism to be used in said opening is indicated by the first bright prism in the series.     5. A testing device comprising a series of prisms of various angles connected together and adapted to be mounted in a testing-frame provided with two openings, said prisms interposed between said openings, each prism being marked so as to indicate the angles thereof, said prisms uniformly varying from one end of the series toward the other whereby the proper prism for any given window may be found by interposing the series of prisms between the observer's eye and the window and noting the first bright prism in the series. OLIN H. BASQUIN. Witnesses:     DONALD M. CARTER,     BERTHA C. SIMS.