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\fdO'^ - Old Forge Coal Mines

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(366)<br />

ELEMENTARY MECHANICS. 167<br />

See Art. 857.<br />

(367) If the mountain is at the same height above, and<br />

the valley at the same depth below sea-level respectively,<br />

it will weigh more at the bottom of the valley.<br />

(368) ^^ = 6 miles. Using formula 12,d' :I^::<br />

u/ u ^'^ 3,960' X 20,000 ,^ ^^n

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