While the ecg machine has not technically been around since 1600 the theory behind it has. This pdf notes key points in the progression of the ecg machine from theory to practice. Apart from being a fantastic timeline going through the history of its development there are some incredible moments such as a professor using his own pet dog 'Jimmy' with paws in jars of saline to demonstrate new advancements, and the first oesophageal electrocardiogram was achieved with the aid of a professional sword swallower in 1906. Fantastic advancements in medicine by fantastic means.
http://www.ecglibrary.com/ecghist.html
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