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limits to that extent the illuminating action of the entire prism plate. In all methods of mounting other than electro-glazing, it is necessary first to have a much larger opaque frame than the frame produced by the electro-glazing process, and it is also necessary to have a considerable margin of plane surface about the prism surface to permit such mounting to be carried out; and it will be found that electro-glazing saves 75 per cent of the waste area made necessary in any other method.
    The difficulties, with reference to the strength and tightness of the prism plate increase in a geometrical ratio with the increase of size and hence the electro-glazing method permits the construction of much larger plates than can safely be made by any other process. One reason for this is that since the prisms have a holding contact with each portion of each prism lens the vertical strain is distributed throughout the entire plate, whereas, when the other methods of mounting are used, vertical bars are necessary, so as to suspend the lower margin of the entire prism plate from the heavy cross plate, as in cathedral work, but this is not permissible in the prism plate for the purpose for which this is intended, because such bars are unsightly and obstruct the light.
    It is desirable, of course, in these prism plates, which, in very many instances, are intended to be movable as windows, swinging canopies, etc., to have the least possible weight with the greatest possible prism surface.
    Metal used in mounting the prism lenses is of a greater specific gravity than the glass, but the copper used in the electro-glazing process is of a much less specific gravity than lead. Moreover, the quantity of metal used in the electro-glazing process is vastly less than the quantity required in any other process; therefore the electro-glazing process must, and in practice it is found to produce prism plates 25 per cent lighter than plate glass or prism lenses mounted by any other method.
    In the electro-glazing process a neat, square-root angle brass frame is used as a border for the complete plate, and is in sharp contrast with the heavy, irregular, unsightly frames resulting from the use of other methods, and therefore the electro-glazed prism plate is much more easily and safely
  Pocket Hand-Book of Electro-Glazed Luxfer Prisms - Page 13