Davidson, James Mackenzie, Sir, 1856-1919 · New York, P.B. Hoeber · leaf 22
Pinhole Photograph of a Tube of Larger Focus. The lowest row of pinholes represents a voltage in the primarv of 4, the middlerow of 8, the top row of 12 volts. … Pinhole Photograph, taken Obliquely, of the X-RayProducing Surface on the Target of a Badly FocussedTube.
X-rays · Eye · Foreign bodies (Surgery)
Internet Archive · Medical Heritage Library · Public Domain Mark 1.0. Free to use for anything.
