posed aeroplanes in this manner. The The supporting power of the air has been determined. openings at the bottom. two halves of each of the two middle aeroplanes are Prof. S. P. Langley, of the Smithsonian Institution, The entire chimney was built in three-foot sections, set at a diedral angle with… … wide by 6% feet ed bridge con- in depth. The low- structed entirely er rear aeroplane of wrought iron is rectangular in in its main mem- shape, and 9 feet ‘by 6% feet in width and depth. bers; cast iron being used only for joint boxes con- tions by aeroplane a maximum of 200 pounds per There is a…
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