Lantern slide

Definition and stakes

Various,  Harper's Round Table, March 23…

“ Most young amateurs have an idea that it requires a great deal of skill to make lantern slides, but any one who can make a good negative can soon learn how to make a good lantern slide. The simplest way is by contact-printing. Select a negative free from spots, scratches, or pinholes. It must have fine detail in the shadows, and no harsh contrasts of light and shade. The regulation size of a lantern slide is 31⁄2 by 4, so choose a negative which will still make a good picture if all but the portion included in these dimensions is blocked out. ”
Source: Gutenberg

Various,  The Barnet Book of Photography…

“ A lantern Slide is a transparent positive on glass or other transparent support, usually 31⁄4 inches square, and is placed in the lantern in such a way that by suitable illumination and optical arrangements the image on the slide is made to intercept some of the light given off by the illuminant from a screen, which without the screen would be wholly and evenly illuminated by the light. ”
Source: Gutenberg

Lewis Wright,  Optical Projection. Part 1: The Projection of Lantern Slides

“ This present book therefore only deals with the exhibition of lantern slides, and as such it will, I trust, be found to be of real assistance to the ordinary user of the optical lantern, including clergymen, schoolmasters, army and cadet officers, and others {2}who require advice and instruction in the purchase or use of a lantern.
The essential parts of a lantern are: (a) A slide-holder or carrier to hold the slide; (b) a lens to 'focus' it on the screen; (c) a condenser to converge the light upon slide and lens; (d) a source of light or radiant to provide the necessary illumination
”
Source: Gutenberg

Get perspective with Kwize: daily news enlightened by great literature