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A sphygmograph: an instrument (also known as a 'pulsometer') for recording graphically the features of the pulse and variations in blood pressure. Wood engraving, 1850/1880?
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[London] 408 Oxford Street : Gullan, [1850/1880?]
1 print : engraving ; sheet (trimmed) 15.8 x 10.2 cm
Fig. 1 ; The sphygmograph
Below the image, a chart is shown illustrating the pulse tracings of a sphygmograph
Wellcome Library no. 568357i