Few people have heard of it, yet many consider John Blankenbaker's KENBAK-1 to be the first commercial personal computer.

Koss introduced these headphones over 40 years ago, and they remain affordable favorites to this day.

Make your own photographic emulsion

A truly homemade photograph

Print from a glass plate negative using a handmade silver bromide emulsion, by Terry Holsinger.

If you're tired of paying The Man at Kodak or Fuji, why not try your hand at creating your own photographic emulsion? This silver-based mixture is intended to be coated on glass or film (yes, you get to play with a squeege). You'll need some sort of large-format camera that can accept a photographic plate (this technique will work wonderfully with a simple homemade pinhole camera as well).

The ingredient list reads like a toxic flavor of Jello: Gelatin, potassium bromide, potassium iodide, and silver nitrate. Remember that your emulsion is light-sensitive and you'll have to work in a darkroom with illumination from a safelight. If you're not adventurous enough to mix your own, you can buy premixed liquid emulsion from Photographers' Formulary.

Make a simple film emulsion (via a thread started by Paul Cotto at filmshooting.com)


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