Cause and Prevention of Dust from Automobiles


IN reply to Mr. Elsden, I agree that it is of no use to hold mythical views. I think, however, that he is really mistaken in his views that the slag in “Tarmac” is not penetrated by the tar. Possibly it may not be penetrated by the most viscous constituents, but upon examining a broken piece of “Tarmac” I have found that the surface is distinctly darker than that of slag which has not been treated. The difference is very noticeable under the microscope, and if a bit of slag from the interior of a treated portion is heated the tar is readily seen, which fact appears to be conclusive evidence that penetration by the tar takes place. I do not, however, suppose that the penetration is very uniform, as slag is not a very uniform material, and therefore in some parts the effect might not be so evident.

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COOPER, W. Cause and Prevention of Dust from Automobiles. Nature 72, 507 (1905).

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