To ascertain if there were any such variations, the position of the frame
was changed in azimuth in several experiments. The results were unchanged
showing that any such variation was too small to affect the result.



Change of Speed of Rotation.


In the last four sets of observations the speed was lowered from 256 turns
to 192, 128, 96, and 64 turns per second. The results with these speeds
were the same as with the greater speed within the limits of errors of
experiment.



Bias.


Finally, to test the question if there were any bias in taking these
observations, eight sets of observations were taken, in which the readings
were made by another, the results being written down without divulging
them. Five of these sets are given in the "specimen," pages 133-134.

It remains to notice the remarkable coincidence of the result of these
experiments with that obtained by Cornu by the method of the "toothed
wheel."

Cornu's result was 300400 kilometers, or as interpreted by Helmert 299990
kilometers. That of these experiments is 299940 kilometers.