Assertion: cathode's surface | /r/CapableOf | focus electron
Facets:
value: around 1 mm in diameter
type: OTHER
value: into a small spot
type: TRANSITIVE-OBJECT
value: on the anode
type: LOCATION
Source sentences:
text: The cathode had a concave spherical surface which focused the electrons into a small spot around 1 mm in diameter on the anode, in order to approximate a point source of X-rays, which gave the sharpest radiographs.