ORIGINAL ELECTROMAGNETIC MULTIPLIERS [129]
CONCLUSIONS [135]
ACKNOWLEDGMENTS [136]
Figure 1.—Models of various electromagnetic instruments created by Schweigger, Poggendorf and Cumming in 1821, made for an exhibit in the Museum of History and Technology, Smithsonian Institution. (Smithsonian photo 49493.)
THE EARLIEST ELECTROMAGNETIC INSTRUMENTS
The history of the early stages of electromagnetic instrumentation is traced here through the men who devised the theories and constructed the instruments.