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MAKING MECHANICAL SWALLOWS 211<br />

THE METAL WORKERS<br />

Steel and aluminum play a prominent role in the fuselage of<br />

the modern biplane and monoplane. These parts are carefully<br />

worked and calculated to withstand the maximum of stress I- r<br />

the minimum of weight. Below, workmen are assembling the<br />

skeleton of a speed monoplane.

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