Homemade Magnesium Printer
Length of Magnesium Ribbon Burned Determines the Time of Exposure
Length of Magnesium Ribbon Burned Determines the Time of Exposure
A convenient homemade printing device consists of a smooth board, A, 2 ft. long and 1 ft. wide, and an upright, B, which is 1 ft. square. Bore a hole in the center of the upright for the small tin holder E, to carry the magnesium ribbon, made by folding a piece of tin to fit it. Small pieces of wood, CC, are nailed across the board to hold the ground glass D and the printing frame G. The ground glass is 10 in. from the upright, and the printing frame is 10 in. from the ground glass. The latter is 1 ft. square and is used to diffuse the light from the magnesium ribbon F, which may be purchased from any dealer in photographic supplies. The length of exposure varies according to the length of ribbon which is permitted to burn. This should be tested out carefully before making exposures.—Gustave Straub, Albany, N. Y.
¶In sandpapering a varnished surface between coats, especial care should be taken to avoid rubbing through at sharp edges.
¶In sandpapering a varnished surface between coats, especial care should be taken to avoid rubbing through at sharp edges.