Assertion: hammer's piston | /r/CapableOf | compress air
Facets:
value: above it
type: LOCATION
value: repeatedly
type: TEMPORAL
value: in the cylinder
type: LOCATION
Source sentences:
text: Instead the drive piston compresses air in the cylinder, which then propels the flight piston against a striker, which contacts the drill bit.
text: A hammer uses a piston that repeatedly compresses the air above it, causing shocks that are transmitted directly to the drill bit.