Animal Locomotion: Or, Walking, Swimming, and Flying, with a Dissertation on AëronauticsH. S. King & Company, 1873 - 264 стор. |
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Сторінка 14
... flexible helices or screws , which , in virtue of their rapid reciprocating move- ments , operate upon the water and air by a wedge - action after the manner of twisted or double inclined planes . The twisted inclined planes act upon ...
... flexible helices or screws , which , in virtue of their rapid reciprocating move- ments , operate upon the water and air by a wedge - action after the manner of twisted or double inclined planes . The twisted inclined planes act upon ...
Сторінка 46
... flexibility of the foot contribute greatly to the rapidity 1 The woodpeckers climb by the aid of the stiff feathers of their tails ; the legs and tail forming a firm basis of support . 2 In this order there are certain birds - the ...
... flexibility of the foot contribute greatly to the rapidity 1 The woodpeckers climb by the aid of the stiff feathers of their tails ; the legs and tail forming a firm basis of support . 2 In this order there are certain birds - the ...
Сторінка 66
... flexible stem - like bodies , which depend from the anterior ventral aspect of the animal , the siren having in the same region two pairs of rudimentary limbs furnished with four imper- fect toes , while the proteus has anterior ...
... flexible stem - like bodies , which depend from the anterior ventral aspect of the animal , the siren having in the same region two pairs of rudimentary limbs furnished with four imper- fect toes , while the proteus has anterior ...
Сторінка 71
... bodied fishes , as the eels , and decreased in those whose bodies are short or are comparatively devoid of flexibility . In pro- portion as the curves into which the body is thrown PROGRESSION ON AND IN THE WATER . 71.
... bodied fishes , as the eels , and decreased in those whose bodies are short or are comparatively devoid of flexibility . In pro- portion as the curves into which the body is thrown PROGRESSION ON AND IN THE WATER . 71.
Сторінка 76
... flexible , and more or less elastic posterior margin . They are screw structures , and when elevated and depressed in the water , twist and untwist , screw - fashion , precisely as wings do , or the tails of the fish , whale , dugong ...
... flexible , and more or less elastic posterior margin . They are screw structures , and when elevated and depressed in the water , twist and untwist , screw - fashion , precisely as wings do , or the tails of the fish , whale , dugong ...
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Animal Locomotion: Or, Walking, Swimming, and Flying, with a Dissertation on ... James Bell Pettigrew Попередній перегляд недоступний - 2016 |
Загальні терміни та фрази
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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