outward by a miniature spiral spring layer or series are arranged so as to break joint’ with those of the other layers, a proper binding material or cement being interposed between each series. This In removing the sensitive plate, the pivoted clamp is dry plates is a leaky plate holder,… … Fig. 4 shows the pivoted clamps down, when hold- since the slightest,trace of light entering at some mi- ing the plates. The dotted line indicates the position when thrown up. nute crevice will frequently damage a day’s work. By Fig. 5 represents another form of a rigid angular its simplicity,…
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