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Scientific American, Vol. 43, No. 14 (1880) (1880)

leaf 3

An illustration from Scientific American, Vol. 43, No. 14 (1880), 1880, leaf 3
The zone of maximum heat is near- Ophir and Mexican on the east. The course of the tunnel IMPROVED BLACKING BRUSH. will continue a little east of north until it connects with the est to the lower part of the boiler, and the laws of the heat- The engraving represents a novel blacking brush recently… … at the present time, as the tunnel hold the dauber. in either of its po- has over a thousand feet yet to go sitions. in order to reach the Union shaft, When the brush is not in use the and all the way through the Golden cover is placed on the blacking box Gate ground, passing directly beneath the…

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