@article {MATHEDUC.06429556,
author = {Akopyan, Arseniy V.},
title = {The lemniscate of Bernoulli, without formulas.},
year = {2014},
journal = {The Mathematical Intelligencer},
volume = {36},
number = {4},
issn = {0343-6993},
pages = {47-50},
publisher = {Springer US, New York, NY},
doi = {10.1007/s00283-014-9445-5},
abstract = {``A polynomial lemniscate with foci $F_1,F_2,\dots,F_n$ is a locus of points $X$ such that the product of distances from $X$ to the foci is constant ($\prod_{i=1,\dots,n}|F_iX|=\mathrm{const}$). The $n$-th root of this value is called the {\it radius} of the lemniscate. It is clear that a lemniscate is an algebraic curve of degree (at most) $2n$" (from the text). Using purely synthetic arguments, the author presents three constructions of the Bernoulli lemniscate ($n=2$, $\mathrm{const}=(1/4)|F_1F_2|^2$), one is based on a three-bar linkage invented by James Watt. In the same way it is proved that the Bernoulli lemniscate is an inversion image of an equilateral hyperbola. Finally, a very simple construction of the normal of the Bernoulli lemniscate is described.},
reviewer = {Rolf Riesinger (Wien)},
msc2010 = {G70xx},
identifier = {2015e.00652},
}