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Magnetic wire selector in slide-rule format: "Datalator" for plain enamel wire made 1954 by Perrygraf

Magnetic wire selector in slide-rule format: "Datalator" for heavy synthetics made 1954 by Perrygraf

Replica of William Sturgeon's first electromagnet (complete with wooden stand)

One of the first electromagnets, 1825, reconstruction

1825
Electromagnet with 450 turns, Henry, 1828, (replica)

Joseph Henry's electromagnet, 1888, reconstruction

1888