. The half-tone process. A practical manual of photo-engraving in half-tone on zinc, copper, and brass. Fig. 42. for genera der it more diffi-cult to keepdown the dust. A couple ofdropping bottlesare useful forcontaining theiodine and thecyanide solutionused for cut-ting the nega-tives, as de-scribed later best formof droppingbottles are onthe pipette principle. %. ^>ttU withTletcher* Automehic6topj>

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