OF THE TOTAL FORCE. 



95 



Table VIII. — Regular Solar-Diurnal Variation op the Total Force between July, 1841, f 





and July, 1845. 







Values of -? to six places of decimals, the first three are placed outside the table. 





0.000 1 





0" 



2 



4 



6 8 



10 



Noon 



14 16 



18 20 



22" 



+21.1™ 



.January 



. —056 



+224 ! +055 



—004 ; —007 



+122 



+115 



+273 



—064 



—294 —202 



—144 





February 



. —178 



+038 1 —100 



—115 



+108 



+190 



+193 



+358 



+ 178 



—241 —319 



—119 





March. . 



. —152 



+099 



—019 



—068 



+082 



+072 



+183 



+280 



+019 



—169 —130 



—189 





April . 



. —308 



—126 



-081 



+015 



+158 



+188 



+205 



+311 



+236 



—021 —292 



—286 





May . 



. —375 



—305 



—179 



+073 



+194 



+203 



+294 



+431 



+312 



+017 —294 



—379 





June . 



. —483 



—274 



—175 



—001 



+169 



+312 



+523 



+447 



+362 



—058 —391 



—428 





.July . 



. —519 



-3d3 



—206 



+069 



+ 182 



+323 



+504 



+527 



+387 



—031 —377 



—496 





August 



. —433 



—343 



—246 



—056 



+062 



+289 



+646 



+557 



+345 



—022 —357 



—444 





Septembe 



, —408 



—263 



—218 



—142 



+054 



+226 



+436 



+488 



+343 



+022 1 —240 



—299 





October 



. —077 



+082 



+033 



—056 



+208 



+138 



+135 



+169 



—032 



—180 1 —244 



—177 





November 



. —043 



—033 



—114 



—074 



+075 



+075 



+197 



+196 



—006 



—065 1 —099 



—102 





December 



. —059 



+137 



+062 



—017 1 +062 



+112 



+142 



+173 



—071 —254 —174 



—122 





Year . 



. -257 



—094 



—099 



—031 



+112 



+187 



+298 



+351 



+167 



—108 



—260 



—265 





Summer 



. —421 



—279 



—184 



—007 



+137 



+257 



+435 



+460 



+331 



—016 



—325 



—389 





Winter. 



. —094 



+091 



—014 



—056 



+088 



+118 



+161 



+241 



+ 004 



—200 



—195 



—142 





Annual Inequality in the Diwrnal Variation of the Total Force. — The comparison 

 of the above diurnal variations for summer and winter, with that of the whole year, 

 is given in the following table : — 



Table IX. 



0.000 





0" 



2 



4 



6 



8 



10 



Noon 



14 



16 



18 



20 



22" 



+ 21.1m 



Summer . . 

 Winter . . 



—164 

 +163 



— 185 —085 

 +185 +085 



+024 

 —025 



+ 025 

 —024 



+070 

 —069 



+137 

 —137 



+109 

 —110 



+164 

 —163 



+092 

 —092 



—065 

 +065 



—124 

 +123 





These tabular quantities are exhibited in diagram E, which closely resembles 

 diagram B, Part VIII, of the Vertical Force. 



(E). Semi-Annual Inequality in the Diurnal Variation of the Total Force. 



+ 180 

 150 

 120 

 090 

 060 

 030 

 0.000000 

 030 

 060 

 090 

 120 

 150 



— 180 



December, 1864. 



1 



1 





1 





1 1 1 



I 1 1 



- 



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/ 



\/^\ 



\ 



,.,. 1... 1 





^'- 



\ 

 \ 



V 





/ 



\ 



/ 



- 





_./ 







/ 

 / 

 / 







r 



\ 







\ 





/ 



1 







/ 



\ 



- 







\ 

 \ 



/ 

 / 



\. - 



- 







' V 



\- 



" 



1 





1 1 





, , , 



1 1 1 



6 8 10 g 14 16 18 20 22 24i> (+21.1"") 

 o 



Philadelphia mean time. 



