EN156
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2 revisions | jasirs94 at Nov 20, 2016 09:01 PM | |
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156G134 but also the ends of the lead-pencil line into immediate contact.) Having done so, and the ribbon ends being already pasted together, please to take a differently colored pencil and between your line and the right hand edge of the ribbon mark another line and continue it until it returns into itself with[out] crossing your first line. The second line will have twice the length of the ribbon. Now the surface of your half twisted ribbon-ring has in the direction of its length the same shape that the projective geometers conceive a plane to have in every direction. Your first line along the middle is like their straight line on the plane. The other line | 156 |