Optic projection : principles, installation and use of the magic lantern, projection microscope, reflecting lantern, moving picture machine, fully illustrated with plates and with over 400 text-figures (1914)

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CH. VIII] PREPARATION OF LANTERN SLIDES 201 E. Italian slides. — In Italy the sizes are 85 x 85 mm., 85 x 100 mm. and 90 x 120 mm., that is, the British (B), the French and American (A, C) and German (D) sizes. In all countries those of larger and smaller sizes than the above standards are used for special purposes; and provision is made FIG. 112. AN AMERICAN LANTERN SLIDE, FULL SIZE, WITH INSTRUCTIONS FOR MAKING LANTERN SLIDES DIRECT. THE SLIDE is PROPERLY "SPOTTED." everywhere for the square British slides of82_5x82.5 mm. and also for the oblong form of 82 or 85 x 100 mm. of the French and American manufacturers. Any oblong form has the advantage that it is always put into the carrier with its long side horizontal and therefore requires only one mark or spot to indicate how it shall be inserted for an erect