Assertion: steam engine's piston | /r/HasProperty | balanced at 180°
Facets:
value: usually
type: TEMPORAL
Source sentences:
text: When the double-expansion group is duplicated, producing a four-cylinder compound, the individual pistons within the group are usually balanced at 180°, the groups being set at 90° to each other.
text: When the double-expansion group is duplicated, producing a 4-cylinder compound, the individual pistons within the group are usually balanced at 180°, the groups being set at 90° to each other.