This book is an attempt to reconstitute the tacit knowledge—the shared, unwritten assumptions, values, and understandings—that shapes work of science. Jed Z. Buchwald uses as his focus social intellectual world nineteenth-century German physics. Drawing on lab notes, published papers, unpublished manuscripts Heinrich Hertz, recreates Hertz’s 1887 invention a device that produced electromagnetic waves in wires. The itself was serendipitous quickly transformed, but early experiments led major innovations electrodynamics. explores difficulty Hertz had reconciling theories other physicists, including Hermann von Helmholtz James Clerk Maxwell, he considers complex often problematic connections between theory experiment. In this first detailed scientific biography community, demonstrates knowledge can be recovered so we begin identify unspoken rules govern practice.