Electrocardiograph machine, c.1940

Electrocardiograph machine, c 1940.
ECG machine by the Cambridge Instrument Co. A unique calibrating model, c.1940. With 2 rolls cardiograph paper, box of ECG leads and spare parts, & galvanometer (without scale).
Currently on display in:
The Science and Art of Medicine
Year made :
Inventory number :
Xsl file could not be processed