me left operates the dia- of an extensive series of sixty-four tables of measure- introduction to the photographic world. phragm plate, seen on the other side more clearly in ments of mean volta electromotive force that the dilu- In taking a picture with the camera only two move- Fig. 3, by the… … Fig. 1—THE EXTERIOR. the rear turn at right angles downward. The Fig. 2.—THE SHUTTER. operation is similar to the old fashioned revolv- When a carrier is turned down, alcohol, the Ziquefaction of either the positive or nega- black pebbled leather. tive metal of the cell by means of mercury, the…
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