Assertion: curtain | /r/CapableOf | accelerate across film gate
Facets:
value: slightly
type: DEGREE
value: technically
type: MANNER
Source sentences:
text: The exposure slit is formed by drawing open the first curtain onto one drum and then pulling closed the second curtain off a second drum after a clockwork escapement timed delay (imagine two overlapping window shades) and moves at one speed (technically the curtains are still accelerating slightly) across film gate.