Hectograph
Developed in the 1870s, the Hectograph (also spelled Hektograph) was an early document copying process which used a tray of gelatine to transfer ink from a master sheet onto copy…
Spirit Duplicators: Copies Never Smelled So Good
Widely used throughout the 20th Century by schools, churches, fan clubs, and other small organizations, Spirit Duplicators or "Ditto" machines allowed small runs of documents to be copied cheaply and…