. Minor and operative surgery, including bandaging . whichserves to magnify the column of mercury, and thus 176 MINOR SVRGERY. enables the observer without difficulty to note the positionof the index (Fig. 149). The temperature of the body may be taken in themouth, axilla, vagina, or rectum; the two former loca- Fig. 149. Ficx. 150. Clinical thermometer. Surface thermometer. tions are those generally selected. When taken in theaxilla, care should be exercised to see that no clothing isinterposed between the skin and the instrument; and SKIAGRAPHY. Ill when the mouth is used for thermometric ob
. Minor and operative surgery, including bandaging . whichserves to magnify the column of mercury, and thus 176 MINOR SVRGERY. enables the observer without difficulty to note the positionof the index (Fig. 149). The temperature of the body may be taken in themouth, axilla, vagina, or rectum; the two former loca- Fig. 149. Ficx. 150. Clinical thermometer. Surface thermometer. tions are those generally selected. When taken in theaxilla, care should be exercised to see that no clothing isinterposed between the skin and the instrument; and SKIAGRAPHY. Ill when the mouth is used for thermometric observations thepatient should be instructed to keep his lips tightly closedand breathe through his nose. The thermometer shouldbe kept in place for from three to five minutes. Surface thermometers are sometimes employed, theinstruments for this purpose having bulbs of a discoidshape (Fig. 150), or being drawn out in the form of aspiral or coil. In using this form of thermometer to de-termine the amount of variation of the surface tempera- Fig. 1 Apparatus for taking skiagraphs. (Park.) ture, the temperature of corresponding parts of the bodyon the opposite side and the general temperature of thebody should be taken at the same time. SKIAGRAPHY, OR EMPLOYMENT OF THE RONTGEN RAYS. Rontgen, in 1895, while investigating the cathode raysas developed in Crookess tubes, discovered the energvwhich lie named .r-ravs. The rays are invisible, but have 12 178 MINOR SURGERY. great power of penetration, and pass through many sub-stances which are opaque to sunlight and ordinary electriclight. If the rays are intercepted by a body not readilypermeable, which is placed between the Crookess tube and Fig. 152.
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