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Weierstrass’ elliptic functions; addition theorem
A dual transformation is discussed, by which a concurrent chart represented by one equation is transformed into an alignment chart or into a tangential contact chart. Using this transformation an alignment chart where three scales coincide and a tangential contact chart consisting of a family of circles, which represent the relation $u+v+w=0$, are constructed. In this case, a form of the addition-theorem for Weierstrass' function involving no derivative is used.
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[3] Epstein L. I.: Nomography. Interscience Publishers, Inc., New York, 1958, 118-129. MR 0107990 | Zbl 0084.11803
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