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. |
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