Catalogue of apparatus, to illustrate magnetism, galvanism, electrodynamics, electromagnetism, magno-electricity . Fig. 167. Flat Spiral. Price, per lb., 75 centsto $ ; Fine Wire Coil, per lb., $ Fig. Fig. 168. Double Helix and Electrotome. Price $ OF AIPARATl S. 15 Fig. 164. ^

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Keywords: ., bookautho, bookcentury1800, bookdecade1850, bookpublisherbostonsn