The direction of rotation matters, just like the speed of rotation matters.

In other words, instead of measuring the deflection, the speed of rotation was measured.

The greater the speed of rotation, the less the pitch for a given aeroplane speed.

This continues until the speed of rotation has increased to about 60 revolutions per minute.

Loss of heat by radiation permitted corresponding contraction in size, and increased speed of rotation.

To measure the speed of rotation, a tuning-fork, bearing on one prong a steel mirror, was used.

It contains the volume within a distance that relates the speed of rotation to the speed of light.

If something did strike the ring, it would strike at a minimum of 770 miles per second, the speed of rotation of the ring itself.