Of the three sets of instruments made, respectively, by Schweigger,
Poggendorf and Cumming, those of Schweigger are the most elementary, and
the least realistic from a practical point of view. He makes little
effort to investigate the effect of any design parameters, but presents
some odd conductor configurations that involve unimportant variations of
the basic principle. The following extracts from his first three
papers[13] contain the major references to his conception, construction,
and use of his multiplier.