The pair of magnets presented here consists of two identical tempered steel rods (29 x 2.5 x 0.7 cm) kept in a wooden box signed on the inside by the manufacturer.
The two magnets bear the letters N and S to indicate the poles; the same letters are printed inside the box to ensure that they are kept in the correct position between the iron clamps.


Bibliografia:
Daguin (1878), T. III, p. 46
De La Rive (1854), T. I, p. 202
Perucca (1949), Vol. II, p. 465


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