Assertion: microscope's condenser | /r/CapableOf | focus knob
Facets:
Source sentences:
text: the other is on a rack and pinion system and is controlled with a condenser focusing knob.
text: a 1.25 N.A. There are two types: one is a spiral type that you turn to move it up or down and the other is on a rack and pinion system and controlled with a condenser focusing knob.