Animal Locomotion; Or, Walking, Swimming, And Flying, With a Dissertation On Aëronautics
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In our eReader you can find the full English version of the book. Read Animal Locomotion; Or, Walking, Swimming, And Flying, With a Dissertation On Aëronautics Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book Animal Locomotion; Or, Walking, Swimming, And Flying, With a Dissertation On Aëronautics
What reading level is Animal Locomotion; Or, Walking, Swimming, And Flying, With a Dissertation On Aëronautics book?
To quickly assess the difficulty of the text, read a short excerpt:
1 'ounce of body.
In the gannet there is only one foot one square inch of wing for every 2 lbs. 4J ounces of body. The gannet has, consequently, less than half of the wing area of the heron.
The gannet's wings are, however, long narrow wings (those of the heron are broad), which extend transversely across the body; and these are found to be the most powerful — ^the wings of the albatross — which measure fourteen feet from tip to tip (and only one foot across), elevating 18 lbs. without difficul...ty. If the wings of the gannet, which have a super- ficial area of three feet three inches square, are capable of elevating 7 lbs., while the wings of the heron, which have a superficial area of four feet four inches, can only elevate 3 lbs., it is evident (seeing the wings of both are twisted levers, and formed upoli a common type) that the gannet's wings must be vibrated with greater energy than the heron's wings ; and this is actually the case. The heron's wings, as I have ascer- tained from observation, make 60 down and 60 up strokes every minute ; whereas the wings of the gannet, when the bird is flying in a straight line to or from its fishing-ground, make close upon 150 up and 150 down strokes during the same period.
What to read after Animal Locomotion; Or, Walking, Swimming, And Flying, With a Dissertation On Aëronautics?
You can find similar books in the "Read Also" column, or choose other free books by James Bell Pettigrew to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
1 'ounce of body.
In the gannet there is only one foot one square inch of wing for every 2 lbs. 4J ounces of body. The gannet has, consequently, less than half of the wing area of the heron.
The gannet's wings are, however, long narrow wings (those of the heron are broad), which extend transversely across the body; and these are found to be the most powerful — ^the wings of the albatross — which measure fourteen feet from tip to tip (and only one foot across), elevating 18 lbs. without difficul...ty. If the wings of the gannet, which have a super- ficial area of three feet three inches square, are capable of elevating 7 lbs., while the wings of the heron, which have a superficial area of four feet four inches, can only elevate 3 lbs., it is evident (seeing the wings of both are twisted levers, and formed upoli a common type) that the gannet's wings must be vibrated with greater energy than the heron's wings ; and this is actually the case. The heron's wings, as I have ascer- tained from observation, make 60 down and 60 up strokes every minute ; whereas the wings of the gannet, when the bird is flying in a straight line to or from its fishing-ground, make close upon 150 up and 150 down strokes during the same period.
What to read after Animal Locomotion; Or, Walking, Swimming, And Flying, With a Dissertation On Aëronautics?
You can find similar books in the "Read Also" column, or choose other free books by James Bell Pettigrew to read onlineMoreLess
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