Catalogue of apparatus, to illustrate magnetism, galvanism, electrodynamics, electromagnetism, magno-electricity . Fig. 138. Axial Telegraph, with block-work. Price $25. to 33 daviss catalogue Fig. Fig. 135. Signal Key. Price $ Fig-. 146.

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Keywords: ., bookautho, bookcentury1800, bookdecade1850, bookpublisherbostonsn