Excerpt from The Sphygmograph and the Physiology of the Circulation: A Monograph Read Before the Medical Society of New Jersey, Upon Investigations Made Preparatory to a Larger Work on the Practical Value of the Sphygmograph The pen may be fed with ink, by the ordinary writing pen or pencil brush. The time required to take a tracing with this instrument, is from one to three minutes and as no fastening is required, the observations made have not been marred by the fears of the patient, or the difficulties usually experienced In maintaining perfect quiet. The artificial heart referred to, was made as near as possible of the natural capacity, and the capillary circulation designed to bear a similar correspondence between its parts, as exists in the arterial and venous systems of the human subject; its difference from the heart in propulsive and contractile power being compensated by the avoidance of a too great ex tension or reduction in size of the smaller capillaries. Farther reasons for believing this artificial heart to be a fair representation of the natural organ, will be hereinafter stated. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.