170 



Report of the Keio Committee. 



Table III. — Hourly Means of the Horizontal Force at the Kew Observatory, 

 0-18000 + (C.G.S. units). Temperature) on Five selected quiet 



Hours 



Mid. 



1. 



2. 



3. 



4. 



5. 



6. 



7. 



8. 



9. 



10. 



11. 





Winter. 





1891. 



















































Months. 



















































Jan. 





184 



182 





183 





185 





188 





189 





189 





190 





187 





180 





178 





174 





Feb. .. 



187 



187 





185 





186 





186 





188 





190 





192 





189 





183 





179 





176 





March. . 



192 



190 





189 





188 





189 





190 





190 





187 





179 





175 





168 





172 





Oct. 





206 



201 





200 



202 





201 





202 





203 





201 





195 





182 





171 





170 





Nov. . . 



190 



189 





189 





190 





192 





192 





194 





190 





185 





175 





166 





168 





Dec 





199 



202 





203 





204 





205 





207 





210 





212 





210 





205 





200 





197 





Mean. 



193 



192 



192 



193 



194 



195 



196 



195 



191 



183 



177 



176 





Summer. 





April . . 



196 



195 





193 





194 





191 





190 





190 





187 





179 





173 





168 





169 





May .. 



200 



195 





194 





194 





191 





188 





185 





180 





175 





169 





169 





175 





June . . 



201 



199 





198 





198 





199 





196 





191 





185 





178 





171 





170 





'170 





July .. 



202 



204 





202 





201 





199 





198 





194 





189 





183 





175 





171 





174 





Aug. .. 



212 



209 





206 





208 





208 





204 





201 





195 





184 





177 





173 





182 





Sept. . . 



204 



200 





200 





197 





197 





196 





193 





186 





177 





169 





164 





170 





Mean . . 



203 



200 



199 



199 



198 



195 



192 



187 



179 



172 



169 



173 







(C.G.S. units.) 













Table IY. — Diurnal Range of the Kew 



Hours. 



Mid. 



l. 



2. 



3. 



4. 



5. 



6. 



7. 



8. 



9. 



10. 



11. 





Summer mean. 







I 



+ -00008|+ • 



OC005 



+ 



00004 



+ 



00004 



+ 



•00003 



•00000 





•00003 





•00008 





•00016 





•00023 





•00026 





- -00022 





Winter mean. 





+ -00003 



+ ■ 



00002 



+ 



•00002 





•00003 



+ 



•00004 



+ 



•00005 



+ 



•00006 



+ 



•00005 



+ 



•OC001 





•00007 





•00013 





- -00014 





Annual mean. 







+ •00005! + 



OOC03j+ 



00003 



+ 



00003 



+ 



00003 



+ 



•00002 



+ 



•00001 





•00002 





•00007 





00015 





•00019 





- -00018 





Note.— When the sign is + the 



