Among his disciples was an unemployed Baptist minister named Ebenezer Kinnersley. Franklin suggested he might both serve science and earn his living if he held electrical demonstrations. Kinnersley’s first announcement of a lecture, held in Newport, described “electrical fire” as having “an appearance like fishes swimming in the air,” claiming this fire would “live in water, a river not being sufficient to quench the smallest spark of it.” He promised his audience such wonders as “electrified money, which scarce anybody will take when offered ... a curious machine acting by means of electric fire, and playing a variety of tunes on eight musical bells ... the force of the electric spark, making a fair hole through a quire of paper....” Kinnersley lectured in the colonies and the West Indies and was hugely successful. Neither he nor any of the other collaborators could rival Franklin’s own achievements. Early in 1747, he gave the names of positive and negative (or plus and minus) to the two types of electricity, to replace the unwieldy terms, resinous and vitreous. Positive and negative electricity became part of the scientific vocabulary. He was the first to refer to the _conductivity_ of certain substances. Electricity passed easily through metals and water; they were _conductive_. Glass and wood were _nonconductive_, unless they were wet. He also noted that pointed metal rods were wonderfully effective “in drawing off and throwing off the electrical fire.” After he retired in 1748, he spent much more time on electricity. To Peter Collinson in London he wrote, “I never was before engaged in any study that so totally engrossed my attention and my time as this has lately done.” He kept Collinson informed in detail of his experiments, not because he thought he had the final word but in the hope that his experiments might possibly prove helpful to English scientists. It was to Collinson he described an electrical party to be held on the banks of the Schuylkill River in the spring of 1749: “A turkey is to be killed for our dinner by the electrical shock, and roasted by the electrical jack, before a fire kindled by the electrified bottle; when the healths of all the famous electricians in England, Holland, France, and Germany are to be drank in electrified bumpers, under the discharge of guns from an electrical battery.”