Broadsides

Abstract Patrick Coad (1783-1872), an Irish immigrant who settled in Philadelphia, was the first patentee of a graduated galvanic battery with insulated poles. Touting his battery among other uses as an instrument that helped cure various diseases, Coad’s invention attracted a good deal of attention within the scientific and medical communities. A teacher whose interests focused on medicine and the sciences, Coad also travelled throughout Pennsylvania and the surrounding area as a lecturer on the...