Animal Locomotion: Or, Walking, Swimming, and Flying, with a Dissertation on AëronauticsH. S. King & Company, 1873 - 264 páginas |
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Página 4
... pinions , the formidable Gordian knot of flight , there is reason to believe , could be readily untied . That artificial flight is a possible thing is proved beyond doubt - 1st , by the fact that flight is a natural movement ; and 2d ...
... pinions , the formidable Gordian knot of flight , there is reason to believe , could be readily untied . That artificial flight is a possible thing is proved beyond doubt - 1st , by the fact that flight is a natural movement ; and 2d ...
Página 7
... pinions experience the mini- mum of resistance , and effect the maximum of displacement ; the water being intermediate both as regards the degree of resistance offered and the amount of displacement produced . The speed of an animal is ...
... pinions experience the mini- mum of resistance , and effect the maximum of displacement ; the water being intermediate both as regards the degree of resistance offered and the amount of displacement produced . The speed of an animal is ...
Página 9
... pinions . This can only be done in virtue of the weight of the bird acting upon the inclined planes or kites formed by the wings as stated . The weight of the body plays an important part in walking and swimming , as well as in flying ...
... pinions . This can only be done in virtue of the weight of the bird acting upon the inclined planes or kites formed by the wings as stated . The weight of the body plays an important part in walking and swimming , as well as in flying ...
Página 72
... pinion , as I shall show presently , being essentially a spiral organ . The twisting of the pectoral fins is well seen in the com- mon perch ( Perca fluviatilis ) , and still better in the 15 - spined Stickleback ( Gasterosteus spinosus ) ...
... pinion , as I shall show presently , being essentially a spiral organ . The twisting of the pectoral fins is well seen in the com- mon perch ( Perca fluviatilis ) , and still better in the 15 - spined Stickleback ( Gasterosteus spinosus ) ...
Página 94
... pinion being reversed for this purpose . The object now is not to depress but to elevate the body . Those movements are facilitated by the alternate play of the feet . ( Compare fig . 47 with fig . 37 , p . 76. ) of the former , while ...
... pinion being reversed for this purpose . The object now is not to depress but to elevate the body . Those movements are facilitated by the alternate play of the feet . ( Compare fig . 47 with fig . 37 , p . 76. ) of the former , while ...
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Animal Locomotion: Or, Walking, Swimming, and Flying, with a Dissertation on ... James Bell Pettigrew Sin vista previa disponible - 2016 |
Términos y frases comunes
action aërial animals arms and legs arrangement artificial wave artificial wing ascends axes backwards bat and bird beetle biting surface blades body bones Borelli Compare with fig concave convex coracoid Crown 8vo depressed described downward dugong elastic ligaments elbow-joint elevating and propelling ellipse elytra extension extremities feet fins fish flexed flexible flexion flight flying foot gannet horizontal direction humerus inclined planes increased insect insect wing joint kite less lever limbs long axis manner Marey membranous motion move movements muscles muscular natural wing nervures oblique oscillate pectoral fins pinion porpoise portions position posterior margin posterior or thin primary produced quadruped rapid reciprocating Red-legged Partridge remarkable resistance root rotating scapula screw secondary feathers shoulder-joint side spiral swimming tail thick margin tion trunk twisting universal joint upward direction upwards and forwards velocity vertical vertical direction vibrate walking wave wing waved track weight wing descends
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