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)
inserting this piece into its recess one side up, thelightning-rod (represented by the dotted line) is made continuotis,from the top of the tower to the chain below. By turning the pieceover, the metallic connection can be broken. If the charge of a Leydenjar is passed through the rod when the… … Means of safety.—Persons who suffer with fear of being struckby lightning, may feel a sense of secttrity b} putting on silk clothing,and sitting in an insttlated chair placed in the middle of the room.The chair can be conveniently insulated with four glass tumblers, orpieces of thick glass. Or they…
Physics · Astronomy
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