General Electric made an industrial short in the 1920s, a silent film that shows how the company produces porcelain insulators for power lines.
Porcelain insulators of this time period were made from china clay, ball clay, flint, and feldspar. In the dry process, ingredients are pulverized and screened to a fine powder and then pressed into moulds. Once moulded, they are trimmed by hand to remove fins and flashing. The pieces are then spray-glazed while spinning on a vertical lathe.
We share with you this version of the short, edited with the addition of some playful ragtime music. We hope you enjoy it!