Johnson's natural philosophy and key to philosophical charts : illustrated with 500 cuts; being reduced photographic copies of all the diagrams contained in the author's philosophical series of indestructible school charts ; for the use of schools and families (1878)
y ofthe experimenter becomes negatively electrified. When the tension ofthe positive fluid of the machine and the negative fluid of the bodyovercome the resistance of the air, they rush together with a sharpcrack and a bright light, which constitutes the spark. If the electricalmachine is… … 685. Figure 17.—Electrical puppets consist of little figures,made of cork, pith, or some similar substance, which are made to dance Fig. 17. by means of electrical attraction and repulsion. These are placed betweentwo metallic plates, as shown ; thelower one being connected with theearth, and the…
Physics · Astronomy
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