The Lost Knowledge column explores the possible technology of the future in the forgotten ideas of the past (and those just slightly off to the side). Every other Wednesday, we look at retro-tech, "lost" technology, and the make-do, improvised "street tech" of village artisans and tradespeople from around the globe. "Lost Knowledge" was also the theme of MAKE Volume 17
Ever since we humans started making shadow puppets in the firelight of our caves, we've been fascinated by the power of the projected image. It seems only fitting that, for DIY Movie Making Month, we'd take a look at magic lanterns, some of our first technological baby steps that have delivered us to the age of Avatar.
What is a magic lantern? It's basically a 17th century pre-cursor to the slide, and then movie, projector. The Magic Lantern Society defines a magic lantern as:
...an appliance by means of which transparencies are projected by artificial light upon a screen with the projected image having a diameter generally from thirty to eighty times greater than that of the transparency or slide, whilst the area of the image may be from one thousand to six thousand times as great.
Magic lanterns grew on the developments of magic shadow shows (i.e. shadow puppets), camera obscura, magic mirrors, and other earlier optics and projection techniques. The period of the magic lantern spanned from the mid-17th century to the late 19th. While there is no clear inventor of the device, Dutch astronomer, mathematician, and physicist, Christiaan Huygens (1629-1695), with his lenses designed for use in telescopes, is probably the closest thing to a father of the technology.
Parts of a common type of Magic Lantern. [From The Magic Lantern Society's website]