No. 17

In 1901, Hyde constructed this sextic which is touched by the axes of all screws reciprocal to three given screws (to understand what that means, cf. his articles in Ann. Math. 2nd series, vol. 2, 1901 and in Ann. Math. 4, 1888). It is singular along a cuspidal double curve and 6 points (only 2 can be seen in the real image). W. Barth was so kind to send me its description and equation.

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