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Scientific American, Vol. 93, No. 21 (1905) (1905)

leaf 11

An illustration from Scientific American, Vol. 93, No. 21 (1905), 1905, leaf 11
simple mechanism fa:ture absorbs a for automatically large proportion of controlling street the tar and other railway switches. mixing ingredients In many cases these the life of the ma- efforts have failed, terial is greatly en- owing to the fact hanced. that the mechan- A stretch of road isms… … considerably cheaper in the long run, and which the triggers are mounted to slide. whereas the granite macadam requires re- Within the cast-iron pipe is a connecting MOTORMAN ON THE CAR, making every three years, the tarmac road rod attached at one end to the angle lever will last at least six…

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