Man and abnormal man, including a study of children, in connection with bills to establish laboratories under federal and state governments for the study of the criminal, pauper, and defective classes, with bibliographies . / Fig. 50.—Dynamolabiometer. (Fere and Boyer.) study of the development of the lips of the deaf, and based upon the same principlesas that of the sphygmometer in fig. 55, but madesomewhat stronger. Total lengthof instrument is 20 centimeters; diameter of the disk is 40 millimeters; diameter ofthe body of instrument is 15 millimeters. The maximum amount of pressure is 1
Man and abnormal man, including a study of children, in connection with bills to establish laboratories under federal and state governments for the study of the criminal, pauper, and defective classes, with bibliographies . / Fig. 50.—Dynamolabiometer. (Fere and Boyer.) study of the development of the lips of the deaf, and based upon the same principlesas that of the sphygmometer in fig. 55, but madesomewhat stronger. Total lengthof instrument is 20 centimeters; diameter of the disk is 40 millimeters; diameter ofthe body of instrument is 15 millimeters. The maximum amount of pressure is 1,500grams. The disk is slightly concave on the side that presses the lips. Maker, Ver-din, Paris. THE SPHYGMOGRAPH. The sphygmograph records the variations of blood-pressure in the arteries. Eachtime that the heart sends a wave of blood into the arterial system there is producedin each artery a hardening whicli follows the movement of the wave of Fig. 51 Sphygmograph. (Marey.) There are two kinds of sphygmographs —the direct and those by 51 represents a direct sphygmograph of Marey, which is applied to the exterior ofan artery and records the wave movement (hardening, or change of pressure). Thedirect sphygmograph presses upon the artery by means of a spring, the pressure ofwhich is regulated by a screw A. As the blood-wave comes in the artery the wallsof the artery rise and fall, transmitting this movement to the sphygmograph, whichmovement is recorded by the lever B on the smoked paper D. The arterial wallpressed down by the spring rises, as the blood-wave advances, to the normal diameter. MAN AND ABNORMAL MAN. 193 The radial artery is the one upon which the sphygmograph is usually placed,give tracings of Mareys sphygmograiih: Maker, Verdin, Paris. No. 1.—Normal pulse. We
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