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In order to explain how these models were to be assembled he had developed a drawing technique, which he called "Isometrical Perspective". the 1822 paper "On Isometrical Perspective" Farish recognized the ". — “William Farish (chemist) - Wikipedia, the free encyclopedia”, en.wikipedia.org
Farish published his ideas in the 1822 paper "On Isometrical Perspective", in which he recognized the "need for accurate William Farish (1822) "On Isometrical Perspective". In: Cambridge Philosophical. — “Axonometric projection - Wikipedia, the free encyclopedia”, en.wikipedia.org
That is, the corresponding real symmetric matrix is diagonalised, and the diagonal entries of each sign counted. According to Sylvester's law of inertia two scalar products are isometrical if and only if they have the same signature. — “Metric signature - Wikipedia, the free encyclopedia”, en.wikipedia.org