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586,221 · Basquin · "Prismatic Light" · Page 2 Home  > Prism Glass  > Patent Index  > Page 12

586,221: 2 of 3

in angles or prisms. In this form which I have shown at the top of the plate are prisms having the upper interior angle about seventy-five degrees and the lower interior angle about fifty degrees. This is the prism which with a given base will have its outer edge the least removed from the plane surface of the prism-plate when compared with other prism-lights in the plates. It is therefore taken as a standard for that particular plate and fixes the thickness of the plate and prisms. Farther down along the plate are prisms having an upper interior angle about sixty degrees and other prisms having upper interior angles of seventy-five degrees and lower interior angles of seventy degrees. Obviously such prisms, in order to have the same elevation as the first-mentioned prism, must either have narrow bases or their outer projecting parts must be removed, and if removed the two side surfaces of the prism should preferably be connected by a curved surface. In these two sets of prisms I have shown in dotted lines the distance to which they would project with their sides not connected by curved surfaces, and I have also shown by dotted lines their narrow bases were they to be constructed so as to have the same elevation as the upper prisms and yet have the same number to each unit of distance measured up the plate.     Like parts are indicated by the same letter in both the figures.     A is the surrounding frame.     B B' B² are the prism-lights set in a grid composed of the warps C and the short ties D. The lights are preferably electroglazed into a net or frame. Each prism-light preferably has the plane-receiving surface E. The prism-light B² has the prisms F, the prism-lights B' the prisms G, and the prism-light B the prisms H, these several prisms having the angular arrangement above referred to, and the dotted lines indicate what has already been described.     Of course, so far as the appearance of the light from the exterior is concerned, it is not essential that the prisms should all have an equal elevation; but it is important that there should be an equal number of prisms for each unit of distance up the plate. As previously explained, it is absolutely necessary that there should be prisms of different angles in many such plates in order to adapt them for the conditions under which they are to be used.     I claim—     1. A prism-plate comprising a series of prism-lights secured together in a suitable frame so as to form such plate, each prism-light having uniform prisms but the prisms of different lights varying in angular arrangement.     2. A prism-plate comprising a series of prism-lights and a frame by which they are bound together to form the plate, the prisms

of the plate having different angles but the number of prisms being uniform for each unit of distance measured transversely to the prisms.     3. A prism-plate comprising a series of prism-lights joined together to form such prism-plate, the prisms of the plate having different angles, such prisms arranged so that there are uniform numbers of prisms for equal distances measured transversely to such prisms, and all the prisms of an equal elevation measured from the plane side of the prism-plate.     4. A prism-plate comprising a series of prism-lights joined together to form such prism-plate, the prisms of the plate having different angles, such prisms arranged so that there are uniform numbers of prisms for equal distances measured transversely to such prisms, and all the prisms of an equal elevation measured from the plane side of the prism-plate and all the prisms having equal widths at their bases.     5. A prism-plate comprising a series of prism-lights joined together to form such prism-plate, the prisms of the plate having different angles, such prisms arranged so that there are uniform numbers of prisms for equal distances measured transversely to such prisms, and all the prisms of an equal elevation measured from the plane side of the prism-plate and all the prisms having equal widths at their bases, the plane surfaces of some of such prisms being connected by a curved surface.     6. A substantially flat prism-plate provided with a receiving-surface on one side and a series of prisms running across the plate on the opposite side substantially from edge to edge, such prisms systematically arranged to produce an increased illuminating effect in the apartment and having equal bases and equal elevation, equal numbers for equal distances measured across such prisms, and angles varying systematically and regularly from one portion of the plate to another to give an increasing refraction of the light from one portion of the plate to another.     7. A substantially flat prism-plate provided with a receiving-surface on one side and a series of prisms running across the plate on the opposite side substantially from edge to edge, such prisms systematically arranged to produce an increased illuminating effect in the apartment and having equal bases and equal elevation, and angles varying systematically and regularly from one portion of the plate to another to give an increasing refraction of the light from one portion of the plate to another. OLIN H. BASQUIN. Witnesses:     FRANCIS W. PARKER,     A. R. APPLEMAN, Jr.