Animal Locomotion: Or, Walking, Swimming, and Flying, with a Dissertation on AëronauticsH. S. King & Company, 1873 - 264 páginas |
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Página 4
... enable insects , bats , and birds to fly . Until the structure and uses of wings are understood , the way of " an eagle in the air " must of ne- cessity remain a mystery . The subject of flight has never , until quite recently , been ...
... enable insects , bats , and birds to fly . Until the structure and uses of wings are understood , the way of " an eagle in the air " must of ne- cessity remain a mystery . The subject of flight has never , until quite recently , been ...
Página 23
... , are , as a rule , twisted levers , and act after the manner of screws . This arrangement enables the higher 1 Bishop , op . cit . animals to apply their travelling surfaces to the media on INTRODUCTION . 23 Joints,
... , are , as a rule , twisted levers , and act after the manner of screws . This arrangement enables the higher 1 Bishop , op . cit . animals to apply their travelling surfaces to the media on INTRODUCTION . 23 Joints,
Página 34
... enable the animal to present , when necessary , an exten- sive resisting surface the one instant , and a greatly diminished and a comparatively non - resisting one the next . This arrange- ment secures the subtlety and nicety of motion ...
... enable the animal to present , when necessary , an exten- sive resisting surface the one instant , and a greatly diminished and a comparatively non - resisting one the next . This arrange- ment secures the subtlety and nicety of motion ...
Página 35
... enabling it to fly . The Bat , Phyllorhina gracilis ( fig . 17 ) , flies with a very slight increase of surface . The surface exposed by the bat exceeds that displayed by many insects and birds . The wings of the bat are deeply.
... enabling it to fly . The Bat , Phyllorhina gracilis ( fig . 17 ) , flies with a very slight increase of surface . The surface exposed by the bat exceeds that displayed by many insects and birds . The wings of the bat are deeply.
Página 36
... enable it to fly . It affords an extreme example of modification for a special purpose , - its attenuated body , dwarfed posterior , and greatly elongated anterior extremities , with their enormous fingers and out- spreading membranes ...
... enable it to fly . It affords an extreme example of modification for a special purpose , - its attenuated body , dwarfed posterior , and greatly elongated anterior extremities , with their enormous fingers and out- spreading membranes ...
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Otras ediciones - Ver todas
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 albatross angle animals arms and legs arrangement artificial wave artificial wing ascends backwards ball-and-socket joint bat and bird biped blades body bones Borelli Compare with fig concave convex Crown 8vo depressed described downward dugong 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 ostrich pectoral fins pinion porpoise portion position posterior margin posterior or thin produced quadruped rapid remarkable resistance right arm root rotation sail screw sea-bear shoulder-joint side speed spiral swimming tail thick margin tion travelling surfaces trunk twisting universal joint upward direction upwards and forwards velocity vertical vibrate walking waved track weight wing descends
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