OCR Text |
Show Hist Method of Producing Electricity, h a piece of amber or resin and a piece ' glass be rubbed together and then sep-ted sep-ted they are no longer indifferent to ich other as before, but each attracts the Mr. In this condition the bodies are Jth said to be electrified or charged with ectricity. Evidence of this condition is ily secured by suspending one of the iwged bodies, so that it can move freely, 'hen presenting the other. An electric large may be communicated to bodies ach have not been rubbed on merely ging them in contact with one which aiready electrified. For example, a light " Of pith suspended by a silken thread m bo charged by such contact, and it can le Serve as an electroscope; that is,' it a employed as a means of detecting loelectrio condition of any body to which ybe presented. A light straw, bal-l(a bal-l(a so as to turn freely on a fine point, aT serve the same purpose, explains a nterinScribner. |