Ball, W. W. Rouse (Walter William Rouse), 1850-1925 · London, Macmillan · leaf 197
loop L will become a part of the loop M, In this way,by altering the couplings, we can transform gradually all theseparate loops into parts of only one loop. For example, take the case of three isles, A, B, C, eachconnected with both the others by two bridges. The mostunfavourable way of… … one loop ABACA. Similarly, by re-arranging the couplingsof the four hooks at B, we can combine the loop BCB withABACA and thus make only one loop. I infer from Eulers language that he had attempted tosolve the problem of giving a practical rule which wouldenable one to describe such a figure…
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