Assertion: graphite's property | /r/HasProperty | determined in early 20th century
Facets:
value: experimentally
type: MANNER
Source sentences:
text: While the basic structural properties of graphite were determined experimentally in the early 20th century, the first real theory on graphene's unique chemistry wasn't worked out until 1947, when Canadian theoretical physicist Philip Russell Wallace tried to come up with ways to explain graphite's electrical properties.