The new position is fixed in that the second locking member (4) is reversed through a quarter of a revolution.

The gyropalettes, by turning a quarter of turn, progressively straighten the bottles from the horizontal to the vertical.

If we follow this idea, we want to say that the square root of -1 is obtained by starting at 1 and making a quarter turn.

The new position is fixed in that the second locking member (4) is reversed through a quarter of a revolution.

The controller then returns the filter assembly to filtration operation by a reverse one-quarter turn of the turn knob of the rotatable valve assembly.

This can be accessed by rotating part No. 16 a quarter of a turn.

The turn can be either a half turn or a turn and a half.

revolving plate of a drawing frame

The gyropalettes, by turning a quarter of turn, progressively straighten the bottles from the horizontal to the vertical.

The third rotating frame of reference is of a higher order than the second rotating frame of reference and the second rotating frame of reference is of a higher order than the first rotating frame of reference.

pot of a spinning frame

adaptor of a valve

A wire wrapping device that includes a turntable assembly that is made up of a turntable and a driver adapted to rotate the turntable.

Understanding that a quarter turn is a right angle.

thread tension device of a pot spinning frame