LIST OF ILLUSTRATIONS IN VOLUME I. 



Schweigger's galvanic " multiplier " (2 figures) 



Modification of De la Kive's galvanic ring 



Modification of Ampere's double galvanic rings 



Modification of Sturgeon's galvanic dipping needle (2 figures) 



Action of galvanic dipping needle (2 figures) . 



Another modification of the galvanic ring 



Frame for testing a strong electro-magnet 



Electro-magnetic engine .... 



A convertible galvanic battery (for " quantity " or " intensity ") 



A single element of the galvanic battery 



Homogeneous connector for " quantity " galvanic battery 



Alternate or serial connector for " intensity " galvanic battery 



Plan of the galvanic battery .... 



Lateral electrical induction of parallel wires . 



Coils of copper ribbon to develope electrical induction 



Wire coils to develope electrical induction 



Arrangement of ribbon coil " No. 1," and wire helix "No. 1 " 



Arrangement of ribbon coil " No. 1 " and wire helix " No. 4," 



Arrangement of coil and wire helix, with interposed metallic plate 



Circular plate of lead with segment cut out 



The same, with edges connected by a magnetizing spiral 



Arrangement of two pairs of induction coils . 



Arrangement of three pairs of induction coils 



Another arrangement of double pairs of induction coils 



Glass cylinder, Leyden jar, and magnetizing spiral 



Arrangement of double induction coil with bell-glass interposed 



Arrangement of wires for common electrical induction at a distance 



Disruptive discharge through detached pieces of tinfoil 



Diagrams showing character of the successive inductions 



Arrangement of double induction coils 



Curve to represent induced electrical current . 



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