. The book of photography; practical, theoretical and applied. ear the edge of the rim. For the experi- 66 THE BOOK OF PHOTOGRAPHY. menter of slender means, a satisfactoryhome-made arrangement is shown in A fairly stout can, such as are usedfor packing preserved meat, is taken, anda hole punched in the bottom about thesize of a halfpenny. In this is tightlyfixed a good cork, through the centre ofwhich has been pierced a hole of sufficientsize to tightly fit the tube of the second hole, sufiicient to accommodateanother similar cork, may be punched;and through this, after borin
. The book of photography; practical, theoretical and applied. ear the edge of the rim. For the experi- 66 THE BOOK OF PHOTOGRAPHY. menter of slender means, a satisfactoryhome-made arrangement is shown in A fairly stout can, such as are usedfor packing preserved meat, is taken, anda hole punched in the bottom about thesize of a halfpenny. In this is tightlyfixed a good cork, through the centre ofwhich has been pierced a hole of sufficientsize to tightly fit the tube of the second hole, sufiicient to accommodateanother similar cork, may be punched;and through this, after boring the holeto a proper size, is put a small glass emulsion may be poured in. Another planis to pour hot water into the jacket, andproceed at once with the filtering. If thisis done, the tap fitted to it will be foundan advantage, since the water as it coolsmay be run off and a fresh supply pouredin without upsetting the filtering arrange-ments. Apparatus for Keeping method of keeping constantthe temperature of solutions is by means. .^ Z
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