"There is one such mechanism in a collection of models – the Peaucellier –
Lipkin's mechanism. A version of this mechanism was invented in 1864 by
French engineer Peaucellier. Four years later, in 1868, this invention of
Peaucellier was independently repeated by Petersburg University's
undergraduate L. Lipkin. With another version, Peaucellier just formulated a
problem, the solution of which was given by Lipkin in 1868. Lipkin's res ..."