The Technical World Magazine, Volume 15Technical World Company, 1911 |
From inside the book
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Page 210
... wings in order to rise from the ground and escape danger as swiftly as possible : SO their wings are short and broad . The duck and the pigeon , which FIG . 5. THE ROWING WING OF A FALCON . have a more ample flight , possess narrower wings ...
... wings in order to rise from the ground and escape danger as swiftly as possible : SO their wings are short and broad . The duck and the pigeon , which FIG . 5. THE ROWING WING OF A FALCON . have a more ample flight , possess narrower wings ...
Page 211
... wings . When these birds rest on an elevated 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 considerable ...
... wings . When these birds rest on an elevated 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 considerable ...
Page 213
... wings all together . This is what is produced in the semi - sailing birds with the wings relatively rigid , the tips of which are convex and predominant as in the case of the sea gull and swallow . 213 There results in these birds a ...
... wings all together . This is what is produced in the semi - sailing birds with the wings relatively rigid , the tips of which are convex and predominant as in the case of the sea gull and swallow . 213 There results in these birds a ...
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