. Animal mechanics. Animal mechanics. BONES AND JOINTS OF THE EXTREMITIES 65 vinced of this by observing people who walk awk- wardly, especially if they walk unequally. Look at their feet, and you will see that one foot goes straight forward, whilst the other is turned out- wards, and that when they come upon the straight foot, they come down awkwardly, and have no spring from it. There is another curious circumstance in the form of the thighbone, showing how it is calcu- O ' O lated for strength as well as freedom of motion. To understand it, we must first look to the dish- ing of a wheel — t
. Animal mechanics. Animal mechanics. BONES AND JOINTS OF THE EXTREMITIES 65 vinced of this by observing people who walk awk- wardly, especially if they walk unequally. Look at their feet, and you will see that one foot goes straight forward, whilst the other is turned out- wards, and that when they come upon the straight foot, they come down awkwardly, and have no spring from it. There is another curious circumstance in the form of the thighbone, showing how it is calcu- O ' O lated for strength as well as freedom of motion. To understand it, we must first look to the dish- ing of a wheel — the dishing is the oblique position of the spokes from the nave to the felly, giving the wheel a slightly conical form. When a cart is in the middle of a road, the load bears equally upon both wheels, and both wheels stand with their spokes oblique to the line of gravitation. If the cart is moving o on the side of a barrel- shaped road, or if one wheel falls into a rut, the whole weight comes upon one wheel: but the spokes of that wheel, which were oblique to the. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Bell, Charles, Sir, 1774-1842; Wyman, Jeffries, 1814-1874. Cambridge [Mass. ] Printed at the Riverside press
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