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Luxfer Prisms installed at the Northern Trust Company
THE NORTHERN TRUST COMPANY.

Chicago, October 28, 1897.
    American Luxfer Prism Co., The Rookery, City.

Gentlemen:
    We are greatly pleased with the Luxfer Prisms which have recently been placed in front of the windows of our ground floor banking rooms in The Rookery. Our offices, which formerly were very dark, are now bright and cheerful. Further, in additional to the advantage accruing from natural light, which is of a very great practical value on account of the effect upon the eyesight of our employes, the Prisms are effecting a great saving in the cost of artificial light, which had to be used continually up to the time the Luxfer Prisms were put in position, amounting annually to a large percentage upon the cost of the equipment.

Very yours truly,
F. L. HANKEY, Second Vice-president.
  Pocket Hand-Book of Electro-Glazed Luxfer Prisms - Page 115