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A considerable amount of the rock excavation was broken up and used for back-fill. Earth Excavation. Practically all the earth excavation, amounting to about 57,000 cu, yd., was done with steam shovels. The average quantity of earth excavated by a steam shovel per 10-hour shift was 180 cu. yd.
The chief interest in his design, though it never materialized, lies in the fact that it provided for a double envelope and was the precursor of the ballonet. The first man-carrying airship was built by Henri Giffard in 1852. It had a capacity of 87,000 cu. feet, a length of 144 feet, a 3 horse-power engine, and a speed of 6 miles an hour.
The following table shows the materials used in the dam and slide, and the cost: | | | Stone | Exca- | | | Timber, | Iron, | filling, | vation, | Cost. | | cu. ft. | lb. | cu. yds. | cu. yds.| | + + + + + + Temporary works | 134,500 | 92,000 | 11,400 | | $79,000 | | | | | | | Permanent dam | 265,000 | 439,600 | 24,000 | 6,500 | 151,000 | | | | | | | Slide, including | 296,500 | 156,400 | 32,800 | | 102,000 | apparatus | | | | | | + + + + + + | | | | | | Total | 696,000 | 687,000 | 68,200 | 6,500 | $332,000 | + + + + + +
The volume of material brought down by this slide amounted to about 200 cu. yd. The rock on the south side broke very well, and there were no slides of any consequence.
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