The advance of photography : its history and modern applications (1911)

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326 THE ADVANCE OF PHOTOGRAPHY are sufficiently distinct not to require any detailed explanation. The following points may, however, be of interest. After the dark slide is placed in the camera, before Fkr. 137. exposing the plate, cut off the light by means of black paper. This must be carefully performed by covering the mirror with the paper in one case, and placing the paper between the lamp and the illuminating lens in the other. When ready to expose the plate remove the obstruction. It is of course impossible to give any absolute rule as to the amount of exposure required,