Diseases of children, for nurses, including infant feeding, therapeutic measures employed in childhood, treatment for emergencies, prophylaxis, hygiene, and nursing . d glassslide of kno\Mi dimensions. Under the microscope thenumber of red and white corpuscles is counted in themeasured area. The dilutions being known, the numberof corpuscles in a cubic millimeter can be deduced. The hemoglobin is estimated by means of an instrumentcalled a hemoglohinometer. There is a prism of colored glass so arranged that one-half of a small circular receptacle stands above it, con-taining clear water. The o
Diseases of children, for nurses, including infant feeding, therapeutic measures employed in childhood, treatment for emergencies, prophylaxis, hygiene, and nursing . d glassslide of kno\Mi dimensions. Under the microscope thenumber of red and white corpuscles is counted in themeasured area. The dilutions being known, the numberof corpuscles in a cubic millimeter can be deduced. The hemoglobin is estimated by means of an instrumentcalled a hemoglohinometer. There is a prism of colored glass so arranged that one-half of a small circular receptacle stands above it, con-taining clear water. The other half contains dilutedblood. By means of a reflected light and the movableprism, which is graded from a Hght to a deep reddish hue. DISEASES OF THE CIRCULATORY SYSTEM 195 the two sides are so adjusted that they will be of the sameshade. The percentage is read from a small scale attachedto the sliding prism. Normal blood will read 100 per cent,on this instrument. The specific gravity of the blood is obtained byplacing a drop of blood in a fluid mixture of knownspecific gravity. When the drop remains stationary thespecific gravity is the same as the Fig. 49.—Rogers sphygmomanometer (Morrow). Blood-pressure.—This is taken by means of anapparatus (a sphygmomanometer) which registers inmiUimeters of mercury the amount of pressure that ispresent in the arteries during (i) the passage of the pulsewave (systoHc pressure), (2) the actual pressure in thearteries during diastole (diastoHc pressure). A rubber bag contained in an arm band is placed aboutthe arm above the elbow and air is pumped into this baguntil the pressure is sufficient to compress the artery atthat point. This, of course, stops the pulse. The airis then allowed to escape until the pulse can be felt atthe wrist or heard through the stethoscope placed overthe brachial artery below the encircling band. At thispoint the systolic pressure is read off. The diastolic 196 DISEASES OF CHILDREN FOR NURSES pressu
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectchildren, bookyear192
