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desirable in almost all stores to have the space in the front ten or fifteen feet of the store lighted in a rather more brilliant manner than the rest of the store. In order to accomplish this, the light should be thrown down from the prism plate at an angle below the horizontal from 30° to 40°, depending upon the height from the floor of the prism plate. It is readily seen, therefore, that if the top of the show window is flat and stands in a horizontal position, it will cut off practically all of the light from the prisms coming down in this direction so that the front space of the store will be the darkest area. In order to obviate both of the difficulties suggested above, the show window having a vaulted top is very highly recommended. The bent portion may be made of ornamental glass and present a very neat appearance on the outside. If for any reason it is impracticable to use this form, the show window having a flat top and sloping back from the transom bar at an angle of about 20° below the horizontal is recommended.

General Arrangements.

    It not only becomes advisable to make the walls of the rooms as light as possible, but also to arrange the furniture and all the fittings of the room so as to best utilize the light obtained from the prisms. In general, the objects which require a brilliant light should be located in the fore part of he room, and the objects requiring less brilliant illumination in the rear. So far as possible partitions should be avoided. Where partitions are absolutely necessary they should be reduced either to railings without any filling, or to glass partitions filled with clear or chipped glass, the woodwork of which is very light. Balconies running the length of the room should be avoided if possible, and the same is true of elevated offices. Desks should be arranged so as to take the light over the left should of the man occupying same, or as nearly in this direction as possible. Never arrange a sloping desk so that the occupant faces the light. In the case of machinery which requires a vertical light to fall directly upon some specially important part, it is often convenient to arrange a small highly polished mirror so as to throw the light from the prism plates upon this part, by setting the mirror at
  Pocket Hand-Book of Electro-Glazed Luxfer Prisms - Page 102