The First EEG Machine
Undulator (EEG machine)
This Western Union ink-writing undulator was used in auditory studies as well as in recording the brain waves of animal and human subjects. The undulator (also occasionally referred to as a siphon or syphon recorder) was originally designed to record incoming and outgoing telegraphic messages. This instrument, developed by E. L. Garceau and H. Davis, was the first to graphically record an electroencephalogram (EEG).
You can view the “Undulatory” and other cool tools in the Collection of Historical Scientific Instruments.