What did teachers do before photocopiers? Prior to the commercialisation of the photocopier, many schools used a duplicator.  There are two types of duplicator, a spirit duplicator which uses a multi layered, ink impregnated wax based master copy and a mimeograph which uses a single layered waxed paper master copy. To prepare a spirit duplicator master a teacher would write or type onto the top … Continue reading Behind the Scenes: The Mimeograph