Experiments and Observations on Electricity Made at Philadelphia in America

A series of letters and reports lays out systematic experiments on electrical phenomena, describing apparatus and procedures, observations about charge distribution and transfer, and theoretical inferences treating electricity as a fluid with positive and negative states. It explains the behavior of charged bottles (Leyden jars), sparks and shocks, attraction and repulsion of light objects, conduction through wires and the role of insulating supports, and draws analogies between lightning and laboratory electricity. Practical recommendations for protecting structures from storms follow, along with stepwise experimental evidence, hypotheses about discharge paths, and clear instructions for reproducing and extending the investigations.