Animal Locomotion: Or, Walking, Swimming and Flying, with a Dissertation on AëronauticsD. Appleton, 1893 - 264 páginas |
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Resultados 1-5 de 28
Página 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 ...
Página 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 ...
Página 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 ...
Página 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.
Página 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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Palavras e frases frequentes
action aërial albatross angle animal arms and legs arrangement artificial wave artificial wing ascends backwards bat and bird biped blades body bones Borelli Compare with fig concave depressed described downward dugong effective stroke elastic ligaments elbow-joint elevating and propelling ellipse elytra extended feet fins fish flexed flexible flexion flight flying foot force gannet glide hind horizontal direction humerus inclined planes increased insect wing joint kite less lever limbs locomotion long axis manner Marey motion move movements muscles muscular muscular system natural wing nervures oblique oscillate pectoral fins pinion porpoise portion position posterior extremities posterior margin posterior or thin produced quadruped rapidity remarkable resistance reverse right arm root rotation sail screw sea-bear shoulder-joint side speed spiral swimming tail thick margin travelling surfaces trunk twisting universal joint upward direction upwards and forwards velocity vertical vertical direction vibrate walking waved track weight wing descends