title: Contributions of the vacuum tube to early electrophysiological research.
authors.affiliation: Department of Biomedical Engineering, Purdue University, 1296 Potter Building, West Lafayette, IN 47907-1296, USA.
authors.forename: L A
authors.initials: LA
authors.lastname: Geddes
mesh_terms: D004562:Electrocardiography / Q000266:history* / Q000295:instrumentation; D004569:Electroencephalography / Q000266:history* / Q000295:instrumentation; D004867:Equipment Design; D049672:History, 19th Century; D049673:History, 20th Century; D014618:Vacuum