How did Gauss make use of Hopf link and Whitehead link??

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The author of the book "Knots, Links, Braids and 3-Manifolds: An Introduction to the New Invariants in Low-Dimensional Topology" states (on page 6) the the Hopf link and Whitehead link were known long ago "and used in particular by Gauss". This sentence really eroused my curiosity - how did Gauss make use of these two links? and where does it appear in his Nachlass?

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You might find "GAUSS’ LINKING NUMBER REVISITED" helpful http://www.maths.ed.ac.uk/~aar/papers/ricca.pdf

Excerpt: "The concept of linking number was introduced by Carl Friedrich Gauss in a brief note on a page of his personal diary — a kind of logbook of his most important discoveries ([5, p. 19]) — dated January 22, 1833 (see Fig. 1(a) and the English translation in Fig. 1(b))."

The aforementioned figures, included in the paper, show the notes (in German)