I 14 



DIURNAL INEQUALITIES. 



+20- 



\ 



\ 



\ 



\ 



\ 



\ 



\ 



N 



o Midwinter 



o Ecfumox 



o Midsummer 



-30 



o Year 



20 



2 4 6 8 10 NOON 2 4 6 8 IO I2MiD'T 



Fig. 11. Vertical Force. (Unit ly.) 



