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John Meiggs Ewen
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Individual
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16,530. Ewen, J. M. July 13. Windows.-Prismatic lights for narrow streets &c. are constructed of plates B, B<1>, B<2>, which are plane on the outside and are formed with prismatic ribs F, G, H on the inside. In order to deflect the light into the rooms in a horizontal direction, the angles of the ribs of the lower plates are made smaller than the angles of the upper plates, and are rounded as shown, so that the plates are of the same thickness.
GB189716530D1897-07-131897-07-13Prism Plates for Windows having Prisms of Varying Angular Arrangement.
ExpiredGB189716530A
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