Flying machines: practice and design. Their principles, construction and working (1909)
Kennedy, Rankin, d. 1917 · London [etc.] : The Technical Publishing Co., limited · leaf 116
PRACTICE AND DESIGN. 101 While on the subject of miscellaneous devices we may con- sider the parachute, fig. 45A. It is a very large affair ; a disc of canvas or cotton fabric with a large hole in the centre ; ropes passed over it sustain the weight whose fall is to be retarded. The disc diameter… … and about 30 ft. when arched out. The rate of fall depends upon the size of the hole in the centre, for it is governed by the velocity of the air escaping through this opening. If the opening is too small the air will escape round the outer
Flying-machines · Aeronautics
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