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Animal Locomotion: Or, Walking, Swimming, and Flying, with a Dissertation on ...
James Bell Pettigrew
Sin vista previa disponible - 2016
according action alternately angle animal applied arrangement artificial ascends axis backwards bird body bones carried causing Compare consequently Crown curves depressed descends described direction effective elastic elevated employed enables experiments extended extremities fact fall feathers feet figure figure-of-8 fish flexed flexible flexion flight flying follows foot force forward given gives greater greatly ground hand horizontal inclined increased insect joint kite legs length less lever limbs manner motion move movements muscles muscular natural nearly necessary oblique observed operate opposite pinion planes portion position posterior margin present produced progression propelling rapid referred remarkable represented resistance result reverse rise root rotation running screw seen short side similar space speed spiral stroke surface swimming tail trunk twisting upwards vertical vibrate walking wave weight wing
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