Catalogue of apparatus, to illustrate magnetism, galvanism, electrodynamics, electromagnetism, magno-electricity . Fig. 135. Signal Key. Price $ Fig-. Fig. 146. Revolving Electro-Magnet. Price $ OF APPARATUS. Fig. 140. 31

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Keywords: ., bookautho, bookcentury1800, bookdecade1850, bookpublisherbostonsn