ClipArt ETC
An instrument for recording the form, strength, and variety of the pulse of the heart.

Sphygmograph

An instrument for recording the form, strength, and variety of the pulse of the heart.

A sphygmograph applied to an arm.

Sphygmograph

A sphygmograph applied to an arm.

"An instrument which, when applied over an artery, traces on a piece of paper moved by clockwork a curve which indicates the changes of tension of the blood within... a, band by which the instrument is fastened on; b, spring which rests upon the artery; c, adjusting-screw (with graduated head) which regulates the pressure of the spring b according as the pulse is strong or weak; d, d, supports for paper upon which the tracing is made; e, e to engage the paper positively; g, small spring clockwork (incased) by which motion is imparted to the feed-roller e1; h, milled-headed winding key; i, stop-motion; j, tracer attached to the oscillating arm k, which is moved by the rod l that connects this arm with the spring b." —Whitney, 1889

Sphygmograph with All Parts Labeled

"An instrument which, when applied over an artery, traces on a piece of paper moved by clockwork a curve…

A variation of a sphygmograph.

Dudgeon's Sphygmograph

A variation of a sphygmograph.