II. An account of some experiments, touching the electricity and light producible on the attrition of several bodies

According to the commands of the Society, I have made the following experiments. I caus´d a piece of wood to be turn´d into the form of a short cylinder, it being about four inches diameter, and three in length. This being fixt on an axis, I melted in a ladle about a pound and half of the best sealing-wax I could procure, and when it was fluid. I plung´d the wooden cylinder into it, where I kept it moving round till it had go a coat of it about half an inch thick on its surface.