NO. 8 



HARMONIC PERIODS IN PRECIPITATION ABBOT 



computed and subtracted, in a method illustrated below in figure 3 

 for 54| months. My results, all closely approximating to sine curves, 

 are shown in figure 2. 



Me an oJ 8 ^^v^fAufm oi Ffe rloi 

 \o +!« -10 



273 M o-ntKs CUa-n^ of ^ and ^^ Not R^"^^*".!? • 



' w 4-3 M ^ t4 Ma 



Fig. 3. — A solar constant period cleared of submultiples. 

 Amplitude : 0.20 percent. 



The harmonics of 273 months are shown in figure 2 to range in 

 amplitude from 0.10 to 1.05 of 1 percent of the solar constant. All 

 are far greater than the accidental error of monthly solar constant 



