Page:Popular Science Monthly Volume 38.djvu/668

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THE POPULAR SCIENCE MONTHLY.

ments. For steam-pipes there have been many more or less suitable coverings in the market. But one should receive with much allowance the representations of dealers, who sometimes continue to advertise what has been proved to be of inferior value. Not uncommonly they are anxious to sell that on which they can make the most profit rather than that which is most efficient.