Editing Magic lantern (section)

===Apparatus===
The magic lantern used a concave mirror behind a light source to direct the light through a small rectangular sheet of glass—a "lantern slide" that bears the image—and onward into a lens at the front of the apparatus. The lens is adjusted to focus the plane of the slide at the distance of the projection screen, which can be simply a white wall, and it forms an enlarged image of the slide on the screen.<ref name="ReferenceA">Pfragner, Julius. "An Optician Looks for Work". The Motion Picture: From Magic Lantern to Sound. Great Britain: Bailey Brothers and Swinfen Ltd. 9-21. Print.</ref> Some lanterns, including those of [[Christiaan Huygens]] and Jan van Musschenbroek, used three lenses for the [[objective (optics)|objective]].<ref>{{cite magazine|title=De toverlantaarn in Nederland|first=Daan|last=Buddingh|magazine=Het Photohistorisch Tijdschrift|issue=2|date=2007|trans-title=The Magic Lantern in the Netherlands|url=https://www.luikerwaal.com/newframe_uk.htm?/nederland1_uk.htm|access-date=2022-09-16}}</ref><ref>{{cite journal|title=The Tour of the World by Magic Lantern: Eugene Danguy's Diaphorama|last=Mannoni|first=Laurent|journal=The New Magic Lantern Journal|volume=11|issue=3|date=December 2012|url=https://www.magiclantern.org.uk/new-magic-lantern-journal/item.php?id=4009761|access-date=2022-09-16}}</ref>

Biunial lanterns, with two objectives, became common during the 19th century and enabled a smooth and easy change of pictures. [[Stereopticon]]s added more powerful light sources to optimize the projection of photographic slides.<ref>{{Cite web |title=Biunial and Triunial Magic Lanterns |url=https://www.luikerwaal.com/newframe_uk.htm?/biunial_uk.htm |access-date=2022-09-16 |website=De Luikerwaal}}</ref>