. Electricity : its medical and surgical applications, including radiotherapy and phototherapy . Pocket battery. Fig. 143. Keystone dry cell cautery and diagnostic lamp battery No. 1. 192 ELECTRICITY AS AN AID IN PROGNOSIS AND DIAGNOSIS Various Instruments.—Instruments for exploring the nose, throat, ear,and accessory cavities are shown on pages 341 and 344. The lightattached to a rectal syeculum is shown in Fig. 134. Another form to beused while operating is shown in Fig. 135. The sigmoid can also beilluminated by means of Fig. 136. A vaginal speculum is shown inFig. 137. Small electric lamps
. Electricity : its medical and surgical applications, including radiotherapy and phototherapy . Pocket battery. Fig. 143. Keystone dry cell cautery and diagnostic lamp battery No. 1. 192 ELECTRICITY AS AN AID IN PROGNOSIS AND DIAGNOSIS Various Instruments.—Instruments for exploring the nose, throat, ear,and accessory cavities are shown on pages 341 and 344. The lightattached to a rectal syeculum is shown in Fig. 134. Another form to beused while operating is shown in Fig. 135. The sigmoid can also beilluminated by means of Fig. 136. A vaginal speculum is shown inFig. 137. Small electric lamps are very convenient for testing the pupillary lightreflex. Such an instrument is shown in 2 in Fig. 138, and ophthalmo-scopes with electric light attachment (Fig. 139) are very useful. Surgicaloperations in localities where an intense illumination is desired may bemuch facilitated by the use of some form of head light such as shownin Figs. 138 and 140. A convenient set of instruments is shown inFig. 141, which includes the battery. This one may be either a drycell battery, as shown in Figs. 142 and 143, or an elec
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