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even if this building is so far either to the right or left from the point directly opposite as one-half the width of the street. It frequently happens that the window lenses can be tilted, as in the figure, in the plane Fig. K of the plate so that the window plates can be used in place of canopies. It would be impossible without unduly increasing the size of this book to give sufficient information upon this subject to enable persons not skilled in Lucical Engineering to determine when this can be done to advantage, and what to insert. It is always safe to use canopies in these places, and this is what is recommended. However, if there is any reason why canopies cannot be used, before giving up the proposition entirely, it is best to call an engineer skilled in the subject.

TABLE OF LUXFER PRISM AREAS EXPLAINED.

    Before using the table of Prism Areas it is necessary to find the ZENITH-TANGENT, pages 187-188, and the PRESCRIPTION, pages 189-197, as explained above, pages 81-83.
    The tables on pages 198-235 show the areas of prism plates required to light interiors under various conditions. Any two pages which are in view when the book is open treat all variations of a room of one width. Four classes of illumination have been set down. The first is for occupants who need a very brilliant light such as bookkeepers, dealers in dry goods, clothing, etc. This illumination has been designated "For Desk Work." A second illumination has been provided for those who need a very good light, such as occupants dealing is jewelry, men's furnishings, shoes, books, millinery, etc. This has been designated "For Fine Merchandise." A third illumination has been provided for those requiring a good light for ordinary purposes, such as occupants dealing in hardware, rubber goods, groceries, furniture, etc. This has been designated "For General Merchandise." A fourth illumination has been set down for those requiring still less light, and has been designated "For Storage." Having turned to the pages corresponding to the room width and having selected the table
  Pocket Hand-Book of Electro-Glazed Luxfer Prisms - Page 84