. Radiography and radio-therapeutics . Instead of the upper coin a circular lead disc, cut out of the same sheetof metal, is used, a suitable diameter being 7 mm. Now, it is of the utmost importance that the two articles, the ring andthe disc, be placed symmetrically in the auricles, and as they difEer in externaldiameter, this raises a difficulty. In order to get over this, the diameterof the disc is artificially increased to that of the ring, to AB, by em-. C rt

---

Size: 1937px × 1291px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: ., bo, bookauthorknoxrobert18681928, bookcentury1900, bookdecade1910