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 Ameri- 

 can 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 



