Catalogue of apparatus, to illustrate magnetism, galvanism, electrodynamics, electromagnetism, magno-electricity . Fig. 111. Heliacal Ring and Double Cylinders. Price $4. to 113. Magnetizing Helix. Price (per lb.) $ to Fig. Fig. 120. Double Helix and U-shaped Bar, im-proved. Price OF APPARATUS. 23 Fig. 112. Fisr. 129.

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Keywords: ., bookautho, bookcentury1800, bookdecade1850, bookpublisherbostonsn