The Structure And Life of Birds
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In our eReader you can find the full English version of the book. Read The Structure And Life of Birds 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 The Structure And Life of Birds
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Rowing, then, is out of the question for a bird which is to move at a speed far greater than that of any boat.
How, then, is horizontal movement gained .' To understand this a knowledge of the parallelogram of forces is necessary. The proof of the principle involved will be found in any book on elementary mechanics.
I shall merely try to make clear what is meant. If two forces act upon a body at one point, they combine to make one force. If B A and C A are two forces i82 THE STRUCTURE AND LIFE ...OF BIRDS chap.
acting at A, the comparative length of the lines representing the comparative magnitude of the two forces, then there results a force which is exactly represented both in magnitude and direction by D A, the diagonal of the parallelogram. If, now, we start with a force represented by DA, we can do in imagi- nation, what often happens in reality, break, it up into two forces BA and CA, or other forces acting along two other lines, which must, however, con- FlG. 49.
verge on A from opposite sides of DA.
What to read after The Structure And Life of Birds?
You can find similar books in the "Read Also" column, or choose other free books by F W Frederick Webb Headley to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Rowing, then, is out of the question for a bird which is to move at a speed far greater than that of any boat.
How, then, is horizontal movement gained .' To understand this a knowledge of the parallelogram of forces is necessary. The proof of the principle involved will be found in any book on elementary mechanics.
I shall merely try to make clear what is meant. If two forces act upon a body at one point, they combine to make one force. If B A and C A are two forces i82 THE STRUCTURE AND LIFE ...OF BIRDS chap.
acting at A, the comparative length of the lines representing the comparative magnitude of the two forces, then there results a force which is exactly represented both in magnitude and direction by D A, the diagonal of the parallelogram. If, now, we start with a force represented by DA, we can do in imagi- nation, what often happens in reality, break, it up into two forces BA and CA, or other forces acting along two other lines, which must, however, con- FlG. 49.
verge on A from opposite sides of DA.
What to read after The Structure And Life of Birds?
You can find similar books in the "Read Also" column, or choose other free books by F W Frederick Webb Headley to read onlineMoreLess
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