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\fdO'^ - Old Forge Coal Mines

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182 ELEMENTARY MECHANICS.<br />

(433) See Fig. 34. /'X 14 X 21 X 19 = 2^ X 3^ X 2^<br />

/* 4: O<br />

X 725, or<br />

14 X 21 X 19<br />

W<br />

—24^—f6'^' 18^-4-6'^ -30<br />

ft<br />

W P<br />

Fig. 34.<br />

^<br />

F<br />

-IS"^<br />

(434) See Fig. 35. {a) 35 X 15 X 12 X 20 = 5 X 3 ^ X<br />

3 X fT, or<br />

„. 35 X 15 X 12 X 20<br />

fr = —<br />

5 X 3^ X 3<br />

. ... ., = 2,400 lb. '<br />

.<br />

Ans.<br />

FIO.86.<br />

o<br />

,r1

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