Lantern Slides 
STANDARD SizEs.—British, 34% x 3% in.; American, 4 x 
3% in. Maximum size of picture 3 x 3 in. in both cases. 
Spottinc.—The standard spotting in Britain and the Col- 
onies is with two round spots of colour distinct from that 
used for the binding, placed at the top of the picture, when 
viewed as it appears in nature. These spots go downward, 
and next the condenser when projecting. The American 
standard method is to spot with one “thumb-spot” at the 
bottom left-hand corner of the picture, as viewed in its 
proper direction. This spot is covered by the thumb of the 
right hand, when the lantern is fed from the right hand side, 
and is at the upper right-hand corner, next to the condenser, 
during projection. 
ADHESIVE FOR BINDING STRIPS.— 
Sugar candy 100 g 240 er. 
Water 100 ccm Y, oz. 
Dissolve by heat, and add to: 
Fish glue 400 ccm 2 OZ. 
Brush on thin needle (black) paper, dry, and cut into strips. 
The strips may better be purchased when only small quantities 
are needed. 
LANTERN SLIDE DracrAmMs.—Draw with a hard pencil on 
fine ground glass, and varnish with a strong solution of gum 
dammar in benzole. Or coat plain glass with: 
Sandarac 16.5¢ 128 gr. 
Mastic 16.5¢ 128 gr. 
Ether 800 ccm 13 oz. 
Benzole 165 ccm 24 oz. 
330 
