rod 2), through the switch of battery M, and gradually slide the (Fig. 3) is a plate of glass coated with a film of carbon which the current from each battery flows; and although wheeled collar from the extreme right hand end of rod tissue divided into squares, and is made by exposing the current… … Fig. 2—DIAGRAM OF CIRCUITS. Fig. 3.-SENSITOMETER SCREEN. mated one lamp will, on this account, be good for sev- eral thousand tests before the variation of the light will amount to more than one per cent, trifle more dense than its neighbor, and they are dis- dependent of the galvanometer, it is in…
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