Writing the Pulse : The Origins and Career of the Sphygmograph and Its American Masters by Sandra Moss MA (2018, Trade Paperback)
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Literally a pulse writer, the sphygmograph allowed physicians to study a permanent record (sphygmogram) of the contours and rhythms of the pulse wave. The early masters of the sphygmograph were hopeful that images of the pulse at the wrist could reveal much about the action of the heart and major blood vessels that would prove useful in research and practice.