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VII. On the Proportions and on the Movements of the Human Figure Index
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On the human body in action (380-388).When you want to represent a man as moving some weight consider what the movements are that are to be represented by different lines; that is to say either from below upwards, with a simple movement, as a man does who stoops forward to take up a weight which he will lift as he straightens himself. Or as a man does who wants to squash something backwards, or to force it forwards or to pull it downwards with ropes passed through pullies  188 . And here remember that the weight of a man pulls in proportion as his centre of gravity is distant from his fulcrum, and to this is added the force given by his legs and bent back as he raises himself.


197:188 10: Compare the sketch on page 198 and on 201 (S. K. M. II.1 86b).

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