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proximately 6° and this proved to be more than adequate since
oscillation ranges were restricted to 3° or less.
In the authors' opinion, a small amplitude with the reversal
procedure provides for a more fluid "follow-up" of the moving
gyro-mark and possibly the elimination of torsion effects resulting
from staccato tracking of a rapidly moving target. As the gyro-
mark approaches a turning point, the slowing down process is far
Figure 2
more gradual with a small amplitude, the mark achieving a steady
state on the turn which in the opinion of the authors allows for a
more relaxed and positive identification of the oscillation extremity.
The occasional and unaccountable incidence of "whip" and tremor
of the spinning gyro-mark did tax the observer's concentration
more than somewhat, but in general the target was steady.
During the tests, using the reversal or tracking method, the
initial and final torque-free positions of the gyro-suspension tape
