In 1751 he began delivering lectures on "The Newly Discovered Electrical Fire" — the first of the kind in America or Europe. His advertisement in the "Pennsylvania Gazette" of 11 April 1751, is as follows: "Notice is hereby given to the Curious, that Wednesday next, Mr. Kinnersley proposes to begin a course of experiments on the newly discovered Electrical Fire, containing not only the most curious of those that have been made and published in Europe, but a considerable number of new ones lately made in this city, to be accompanied with methodical Lectures on the nature and properties of that wonderful element."
In 1751, Mr. Kinnersley began delivering lectures on "The Newly Discovered Electrical Fire" — the first of its kind in America or Europe. His advertisement in the "Pennsylvania Gazette" announced his course, which would feature both well-known experiments from Europe and newly discovered ones conducted in Philadelphia. He planned to deliver methodical lectures explaining the nature and properties of this remarkable element.