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"Commercial."
    This term is applied to prism plates composed of selected prism lenses which are not tested, polished, or provided with the Iridian lines on the receiving surfaces. They are sized and electro-glazed.
"Factory."
    This term is applied to the prism plates composed of prism lenses known in the practice as "Seconds," sized and electro-glazed.
PAVEMENT PRISMS.
    For the illumination of basements we manufacture pavement prisms, sometimes called vault lights. These prisms may be used to produce a certain effect without what is known as the lucidux, but where a well illuminated basement is desired, the lucidux, or prism plate placed vertically in the front end of the basement, so as to receive the light from the pavement prisms, and transmit it into the basement, is essential.
    The various classes of pavement prisms are described as follows:
"Multi-Prism."
    In this pavement prism there is preferably an oblong top about 5×2¼ inches, with a single lenticular pendant, both sides of which have been computed on optical principles, so as to produce the greatest possible degree of illumination, and the ends of which are prismed, so as to take the light coming from up and down the street and add it to the quantity of light thrown into the basement.
"Double Prism Extra."
    This pavement prism is substantially 4 inches square on top, and has two pendants, varying in length and angle, and prismed on their ends.
"Double Prism."
    This product is the same as the Double Prism Extra, except that the pendants are not prismed on the ends.
"Single Prism Extra."
    This product is substantially rectangular on top, 2½×3 inches, with a single pendant prismed on the ends.
  Pocket Hand-Book of Electro-Glazed Luxfer Prisms - Page 19