Sounding the ocean of air; being six lectures delivered before the Lowell institute of Boston, in December 1898 (1900)
Rotch, Abbott Lawrence, 1861-1912 · London [etc.] Society for promoting Christian knowledge; New York, E. & J. B. Young & co. · leaf 135
130 SOUNDING THE OCEAN OF AIR kites and which it would not be supposed could fly. As seen from Fig. 9 its appearance is that of two light boxes without tops or bottoms, fastened some distance above each other. The wind exerts its lifting force chiefly upon the front … FIG. 9.— Hargrave Kite. and rear sides of the top box, the lower box, which inclines to the rear, and so receives less pressure, preserving the balance. The ends of the boxes, being in line with the wind, keep the kite steady and serve the purpose of the dihedral angle in the Malay kite. The…
