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Scientific American, Vol. 69, No. 7 (August 1893) (1893)

leaf 4

An illustration from Scientific American, Vol. 69, No. 7 (August 1893), 1893, leaf 4
y at number representing a different employee. As the Liverpool .is claimed to present one of the most strik- H employee enters or leaves ing achievements. Extending as does this tunnel deep ^ he drops this check in the below the bed of the Mersey to the solid red sandstone, - slot at the top of… … or less fouled by the passengers, and the ing, and the passage of the check through the machine ventilation due to train motion then begins to in- as shown in the sectional view. An oppositely extend- trips a hammer which causes an impression to be made crease. The first air entering from the…

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