CHAPTER XII. 



LANTERN SLIDE MAKING. FRAME. TESTING 

 SLIDES. COLOURING LANTERN SLIDES WITH 

 ANILINE DYES. TONING BATHS FOR VARIOUS 

 COLOURS. RULE FOR FINDING DISTANCE OF 

 LANTERN FROM SCREEN. 



Lantern slides, if well made, give pleasure to 

 young and old, whilst their educational value is 

 universally acknowledged to be of great import- 

 ance. They no longer remain the monopoly of the 

 travelling entertainer, since slides are now pro- 

 duced by almost every scientific society. Equally 

 helpful are they in the private house, where one 

 who has learnt how to make them may enjoy 

 many a winter evening, even with only himself 

 for audience. To one who has mastered the art of 

 negative making no difficulty will be experienced, 

 for the developing of lantern slides is similar, except 

 that a positive image appears instead of a negative. 

 This fact renders it much fuller of interest, as the 

 gradual unfolding of the complete image never fails 

 to delight the operator. The standard size for 

 English slides is 3jx3jin., a suitable size for 

 contact printing from a 4^ x 3jin. negative. 



The usual slide-making frame consists of a 

 board having a 3 Jin. square hole in the centre, into 



