Catalogue of apparatus, to illustrate magnetism, galvanism, electrodynamics, electromagnetism, magno-electricity . Fig G. Electro-Magnetic Telegraph, with clockwork. Price $20 to $50. DAVlss CATALOGUE OK APPARATUS. Fig. H. 43. Fig. H. Telegraphic Call or L Price $12.

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Keywords: ., bookautho, bookcentury1800, bookdecade1850, bookpublisherbostonsn