. Journal of radiology . Fig. 7. The sighting apparatus, which is called a telescope, but in realityis an inverted periscope. This contains, in the lower end, a mirror, set at anangle of forty-five degrees, and a cross wire. 52 Till-] JOURNAL OK RADlOUHiV. Fig. 8. Patients head in position, with the injured eye farthest from thetube. Sighting down through the hole in the mirror and the hole in the indi-cator the instrument is manipulated until the indicator exactly centers over thepupil of the eye.

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Keywords: ., bookauthoramerican, bookcentury1900, bookdecade1920, bookyear1920