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THE WINSLOW BROS. COMPANY.
December 15, 1897.
    American Luxfer Prism Co., City.

Dear Sirs:
    In answer to your inquiry with reference to the question of the effect of dust and dirt accumulating on the Prisms in our factory, which were installed a year ago, we beg to say that a recent inspection of them shows that the horizontal ledges of the Prisms in all cases are thickly covered with factory dust in one large room that we have equipped with the Prisms. It has not affected the amount of light in any way so far as we can see. The test in one particular room has been a severe one, as one side of the building is closely in contact with the casting cleaning room of our foundry, which creates an excessive amount of impalpable dust from brushing the castings clean every morning.
    We purposely allowed the dust to accumulate, as we wished to severely test the effect of a large amount of dust for a long period of time accumulating on the Prisms.
    Before we equipped this particular room with the Prisms, a space about 60 feet square, we were burning 15 gas lights the greater part of the day.
    These have all been put out, except on extremely dark days or late in the afternoon, when a few of them are lighted.
    We take pleasure in commending your product to every class of factory use. It is not only economical so far as the actual saving in the expense of gas is concerned, but the workmen themselves are greatly pleased, and seem to be more cheerful under the improved conditions. We shall be pleased to show this room to any one you may send.
Your very truly,
THE WINSLOW BROS. CO.,
By W. H. Winslow, President.


THE ROBERT SIMPSON COMPANY,
Importers of Dry Goods, Wholesale and Retail,
170, 172, 174, 176, 178 Yonge Street,
1 and 3 Queen Street, West.
Toronto, December 6, 1897.
    Luxfer Prism Co., Toronto.

Gentlemen:
    We had Prisms installed in our departmental store upwards of two years ago. The result was most satisfactory, and we still think these Prisms are the greatest invention of the age.
    We have repeatedly asked as to cleaning the Prisms, and we may say that we have had no trouble whatever in this regard. We have found the Prisms much easier to keep clean than ordinary plate glass.
Yours truly,
THE ROBERT SIMPSON CO., Limited.
J. Martin, Secretary.
  Pocket Hand-Book of Electro-Glazed Luxfer Prisms - Page 171