Source: Wikimedia Commons
It was bolted to the wall by the window or beside the door, cast iron, painted the same colour as everything else, with a crank on the side…
Source: Wikimedia Commons
In 1974 the machine at the front of an American classroom was a box with a lamp in it, a sheet of glass on top and a mirror…
Source: Wikimedia Commons
In 1974 the audiovisual experience in an American classroom was forty still photographs on a strip of 35mm film, shown one at a time, with the sound coming…