n the electric motor alone was in service.Gas is taken from the city illuminating mains andcosts $1.05 per 1,000 cubic feet. The engine was runa total of 697 hours, and the gas consumed cost $106.68,or an average of 15.3 cents per hour, which is about1% cents per horse-power hour. Electric current… … Lithographic Color Printing. A widespread but unsuccessful attempt was made,about 1880, to substitute zinc for stone in lithographicwork. After this failure, zinc was generally abandonedas a factor in the lithographic problem, but one firmhas continued to make experiments along this linewith…
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