Page:Proceedings of the Royal Society of London Vol 69.djvu/465

Rh periodic time, such a body would have to rotate at 7 x 10 14 revolutions per second.

I wish to thank Messrs. Siemens Bros, and Co. for the loan of the field magnet, which was altered for the purpose of these experiments.

I have pleasure in acknowledging the help I have received from Mr. F. S. Robertson and Messrs. H. A. Skelton, R. M. Wartze, and M. S. Duffitt. Mr. Skelton has spent a great deal of time in the working out of the results. Mr. T. Jones has also rendered valuable assistance.

Table I.

Diameter and length each 25'4 cm.

Diameter and length each 12-7 x 10 8 cm.

Diameter and length each O'l cm.

Periodic time. 360 seconds

Periodic time.

Frequency. 179 periods per second.

f

7 x 10 9 years

1 H,

90 4

j-717

I 45

1434

12 x 10~ 6 seconds. . . . j 1-3 x 10-" j 3'5 x 10- n 1

960 years. 3'03 x 10 10 seconds. 1 year. 3'1 x 10" seconds. 1 day. 8'6 x 10 4 seconds.