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Interior of the office of F. G. Logan, showing effect of Luxfer Prisms
F. G. LOGAN.
Chicago, June 1, 1897.
    Luxfer Prism Co.,
    Rookery Building, City.

Gentlemen:
    Replying to your favor, we beg to say we find the Prisms all we anticipated, and the result has been to do away with artificial light, except as to places in the office which are shielded from its influence by wall and fixtures. By it, sunlight is carried through to the farther wall and, the intensity of the light such, we were obliged to subdue it at certain hours by shades. The effect upon spirits of employes and customers, we believe, is marked, and we are pleased to commend it in every way, believing it will add health to satisfaction in our case.
Faithfully truly,
F. G. LOGAN,
4 Board of Trade.
  Pocket Hand-Book of Electro-Glazed Luxfer Prisms - Page 150