50 



DISCUSSION OF THE VERTICAL COMPONENT 



The numerical values of the coefficients B^ B^ B^ in the general equation 

 A„ = ^ 4- A sin {Q+ C\) + ^2 sin (20 + C^) + B., sin (36 + C^) 

 expressed in parts of the horizontal force, are given in Table V. The first three 

 decimals (0.000) have been placed in front of the table. 



Table V. 



Month. 





B, 



B. B3 1 



January 



February 



March 



April 



May 



June 



July 



August 



September 



October 



November 



December 











§ 

 o 

 o 



158 

 247 

 181 

 346 

 432 

 .521 

 574 

 564 

 472 

 201 

 145 

 148 



181 

 168 

 119 

 073 

 063 

 102 

 086 

 122 

 096 

 102 

 099 

 142 



026 

 053 

 023 

 043 

 059 

 013 

 023 

 016 

 010 

 036 

 000 

 033 



Summer . 

 Winter . 

 Year . 











482 

 170 

 320 



082 

 132 

 099 



016 

 001 

 007 



The next table contains the numerical values of i?, B.^ Bj expressed in absolute 

 measure, and the angles C^ C^ C3 obtained by the addition of 180° to their pre- 

 ceding values, so as to make increasing values correspond to increasing force. The 

 first two decimals for B are placed at the head of the columns. 



Table VI. 



Month. 



B, 



0.00 



c, 



B2 



0.00 



C, 



o.do 



c. 



January . 

 February 

 March . 

 April . 

 May 

 June 

 July . 

 August . 

 September 

 October . 

 November 

 December 









203 

 317 

 233 

 444 

 554 

 668 

 736 

 723 

 606 

 258 

 186 

 190 



3140 09' 

 271 47 

 278 24 

 269 12 



265 17 

 267 22 



266 30 

 261 10 

 253 57 

 299 48 

 263 33 

 313 49 



233 

 216 

 152 

 093 

 080 

 131 

 110 

 157 

 123 

 131 

 127 

 182 



440 22' 



46 22 



40 22 



355 59 



324 31 



13 56 



354 16 



35 50 



30 24 



56 28 



74 00 



51 57 



034 



068 



030 



055 



076 



017 



030 



021 



013. 



047 



000 



042 



241° 



93 

 275 



52 



98 



30 

 120 

 255 

 345 



30 



243 



Summer 

 Winter . 

 Year . 









618 

 218 

 410 



263 40 

 288 54 

 270 17 



106 

 169 

 127 



11 01 



49 58 

 36 22 



021 



002 

 008 



75 

 75 



The next diagram (E) exhibits the general feature of the diurnal inequality for 

 the year and its summer and winter season, as computed by means of the preceding 

 formulfe. The greatest diiference between the observed and computed values at 

 any one hour is but 2^ scale divisions at 2 A. M. in the winter season, and 1| 

 divisions at the same hour in the annual curve. The absence of the secondary 

 wave in the early morning hours during summer is as conspicuous as its presence 



