A simple time synchronization device for polygraph, analogue tape and digital computer as used in sleep research.
D000703:Analog-Digital Conversion; D003201:Computers; D003202:Computers, Analog; D004568:Electrodiagnosis; D004569:Electroencephalography; D004576:Electromyography; D004581:Electronics / Q000295:instrumentation*; D004585:Electrooculography; D006801:Humans; D012890:Sleep / Q000502:physiology*; D013997:Time Factors