44 Mr. E. Gold : Relation between Periodic Variations of 

 Amplitude a in mm./sec. and Excess of Phase 8 for w *, 



Height 12 3 4 5km. 



T7 , /a 0-63 1-03 1-39 1-65 1-04 



equator | ^ 1940 2Q20 2Q70 2()90 2lQO 



T , 1s o/« 0\5fi 0-93 1-24 1-48 171 



^ ai - i0 [^ 192° 200° 204° 206° 207° 



r f Qnoj« ...... 0-41 0-68 0-88 1-04 122 



1At - dU {<? 185° ]90° 193° 193° 192° 



T . AK0 {a 0-25 0-44 0"59 0'74 0-89 



lAt - 40 \,j 164° 164° 160 Q 157° 153° 



T , Pno f« 022 0-45 069 094 123 



Jjat.ou |^ 123 o 12 40 ^qo llg o 116 o 



In the original equations terms of the form - -^ were 



neglected. This was quite fair in the first approximation, 

 but these terms are of the order T \) of nO u nC 2 and may 

 therefore produce some modification in the values found 

 for d, C 2 . 



The pressure variation in the whole-day wave is not so 

 regular and well defined as for the half-day wave. The 

 principal characteristics are a general decrease in the ampli- 

 tude from equator to pole and from the earth's surface 

 upwards. The decrease upwards continues until the amplitude 

 vanishes. Afterwards it reappears with a change of phase 

 of 180° and at first increases. The variation may with 

 tolerable approximation be represented by 



e=Esin 2 <£( i /W 2; -<r W22 ) sin (»« + \)=E / sin 2 <£ sin (nt + X). 



If /=1*6, 1 = 4: . 10 -6 , m = 4 . 10 -7 , the amplitude vanishes 

 at about 1300 m., and afterwards increases until at 7000 m. 

 it is 1"5 times the surface value. Above this height it 

 diminishes again. 



* The corresponding values for c — Vo, /3 = 2.10~ 6 are as follows : — 



Height 12 3 4 5km. 



tj, , fa 0-46 097 1'28 T69 2-09 



equator | ^ 192 o ig9 o 2 05° 211° 216° 



T , -, ro fa 0-42 0-79 115' 1-51 1-87 



•V at ' i0 )J 190° 197° 203° 208° 212° 



T , onojfl 0-30 057 084 109 1*34 



i,at.csu |. lg0 o 186 o 191 o- 195 o ig9 o 



Lat. 45° 



fa 020 039 0\o9 078 0'98 



\6 153° 157° 159° 162° 163° 



T + PA0 U 021 0-43 0-68 0-90 123 



JjaUl ' |o 113° 118° 123° 125° 127° 



