The Technical World Magazine, Volume 15Technical World Company, 1911 |
From inside the book
Results 11-15 of 28
Page 211
... wings . When these birds rest on an ele- vated support , it is sufficient for them to let themselves fall in order to acquire the start or indispensable spring for the action of the wings . The necessary effort for flight is ...
... wings . When these birds rest on an ele- vated support , it is sufficient for them to let themselves fall in order to acquire the start or indispensable spring for the action of the wings . The necessary effort for flight is ...
Page 212
... wings extended almost without losing any speed ; then a few vigorous strokes of the wings will quickly start them again on their way . Such flying is a gliding over the air , and the great force acquired during the period of the beating ...
... wings extended almost without losing any speed ; then a few vigorous strokes of the wings will quickly start them again on their way . Such flying is a gliding over the air , and the great force acquired during the period of the beating ...
Page 213
... wings ; the shifting of the wings comes into play and as the total mass of the body and of the wings requires much greater energy in order to be displaced from its equilibrium , it is the wings alone that feel the effect of the changes ...
... wings ; the shifting of the wings comes into play and as the total mass of the body and of the wings requires much greater energy in order to be displaced from its equilibrium , it is the wings alone that feel the effect of the changes ...
Page 214
... wings like a fan as the stork in figure nine , in order to give a little independ- ence to the extremities of the feathers . But this slight defect is not sufficient to destroy the brilliant qualities of flight which these birds present ...
... wings like a fan as the stork in figure nine , in order to give a little independ- ence to the extremities of the feathers . But this slight defect is not sufficient to destroy the brilliant qualities of flight which these birds present ...
Page 235
... wings . Some are clumsy in flight , and use their wings mostly as a parachute . The hind pair of legs is longer than the front ones , and is employed in leaping and jumping to considerable distances , which has given to these insects ...
... wings . Some are clumsy in flight , and use their wings mostly as a parachute . The hind pair of legs is longer than the front ones , and is employed in leaping and jumping to considerable distances , which has given to these insects ...
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