. The clinical study of blood-pressure : a guide to the use of the sphygmomanometer in medical, surgical, and obstetrical practice, with a summary of the experimental and clinical facts relating to the blood-pressure in health and in disease . sing it as a basis, constructed his admirable laboratory sphyg-momanometer. c. Mossos Apparatus.^—The essential parts of this rathercomplicated apparatus, shown in Fig. 11, are: 1st, Four metaltubes (BB) enclosing loose rubber glove fingers, into which arethrust the two middle fingers of each hand. 2d, A recordingmercurial manometer (A) connecting with t
. The clinical study of blood-pressure : a guide to the use of the sphygmomanometer in medical, surgical, and obstetrical practice, with a summary of the experimental and clinical facts relating to the blood-pressure in health and in disease . sing it as a basis, constructed his admirable laboratory sphyg-momanometer. c. Mossos Apparatus.^—The essential parts of this rathercomplicated apparatus, shown in Fig. 11, are: 1st, Four metaltubes (BB) enclosing loose rubber glove fingers, into which arethrust the two middle fingers of each hand. 2d, A recordingmercurial manometer (A) connecting with the tubes (BB)through the tube (D), filled with water. 3d, A pump (C),whose piston is slowly depressed by turning a crank. Thewhole apparatus is filled with water from the bottle (F), the For tracings illustrating this see Figs. 18 and 20. Mosso, A. Sphygmomanometre pour mesurer la pression du sang chezrhomme. Arch. Ital. da Biol, 1895, vol. xxiii, p. 177. 52 INDIRECT MEASUREMENT OF BLOOD-PRESSURE air driven out through the cock (E) and the pressure raised,either gradually or by steps of 10 mm. each, until the tracingof the manometer attains its maximum height. This instru-ment is only suited to laboratory use, and shares, with others. KiG. 11.—Mossos SPHVOUOMANOMETKK. which determine pressure in the small vessels of the finger,certain disadvantages to be considered later. It has yieldedmuch accurate information, however, and suggested the evo-lution of our present clinical sphygmomanometers which meas-ure diastolic pressure. DEVELOPMENT OF SPHYGMOMANOMETERS 53 d. OUvers —OUver, in 1898, brought for-ward a simple instrument for the measurement of arterialpressure, consisting of a circular spring manometer, graduatedin mm., Hg., with a hollow metal stem terminating at its footin a small rubber bag filled with fluid. With this, compres-sion is made over any exposed artery until the oscillation ofthe needle on the dial attains its maximum, which Oliverthough
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