10. 



Fig. 8. — Plot illustrating phase angles in computed periods of 22, 24 and 26 

 hours, the real period being 24 hours. 



Fig. 9. — Curve formed from combination of 10 periods of different lengths 

 and amplitudes. 



Fig. 10. — Harmonic analysis of data plotted in curve, Fig. 9, using trial 

 period of 4 days. 



