Used in X-rays
A long, glass and metal glass tube resembling a gun because of the short tube that extends from the long, main glass tube.
Health Sciences Library
State University of New York at Buffalo
Batt, Richard C.
Contact the History of Medicine Collection, http://ublib.buffalo.edu/libraries/units/hsl/history/
Glass and metal
“X-Ray tube,” Digital Collections - University at Buffalo Libraries, accessed January 17, 2018, https://ubdigit.buffalo.edu/items/show/16846.