November 29, 1918. THE COLLIERY GUARDIAN. 1145 MEAN MAGNETIC DECLINATION at Kew Observatory; Richmond, in Degrees and Minutes, for each Two-hour Interval in the Week November 17 to 23, 1918. Intervals—Hours G.M.T. £ c3 &J0 cs ce 0h.-2h. 14° + 2h.-4h. 14° + 4h.-6h. 14° + 6h.-8h. 14° + i 8h.-10h. 14° + 10h.-12h. 14° + I2h.-14h. 14° + 14h.-16h. 14° + 1 16h.-18h. 14° + 18h.-20h. 14° + i 20h.-22h. 14° + 2211.-24h. 11 + Mean for day. 14° + Min. Min. Min. Min. ( Min. Min. Min. Min. Min. Min. Min. Min. Min. Sun., Nov. 17 1 47’0 47’0 46’5 | 46’5 ! ! 46’5 49’5 50’0 49’5 47’5 45’0 45’5 45’0 47’0 Mon., „ 18 0 45’5 46’5 46’0 ! 46’5 ; 47’5 50’0 51’5 50’5 48’5 45’5 44’5 45’5 47’5 Tues., ,, 19 1 46’5 47’0 46’0 45’0 45’5 49’0 51’5 51’0 490 43’5 41’0 43’5 46’5 Wed., ,, 20 0 47’0 47’5 46’5 41’5 44’5 48’5 51’0 51’0 49’0 47’0 ; 45'5 ! 45’0 47’0 Thurs., ,, 21 0 47’0 47’5 47’5 45 ’ 0 45’5 i 49’5 52’0 50’5 47’5 ; ' 45’5 1 44’5 i 45’0 47’0 Friday, „ 22 1 46’0 47’5 47’0 46’0 45’5 j 48’0 50’5 49’0 48’0 ; 46'5 ! 43’5 i 39’5 46’5 Sat., „ 23 1 40’5 40’0 1 43’5 46’0 49’5 53’0 55 ’ 5 54’0 I 53’0 i 46’5 43’5 i 44’5 47’5 Mean value for Diurnal ine- Ih. 2h. 3h. 4h. 5h. 6h. 7h. 8h. 9h. lOh. Uh. 12h. 13h. Uh. 15h, 16h. 17h. 18h. 19h. 20b. 21h. 22h. 23h. 24h. month. quality (i.e., Nov.1917 -0’9 —1’0 -0’6 -0’3 -0’7 -1’2 -1’9 -2’8 -2’9 -1’5 + 1’4 + 3’1 + 3’3 + 3’2 + 2’8 + 2’0 + 0’8 + 0’3 0’0 -0’1 -0’7 -0’9 -0’8 -0’9 14° 56'’6 Nov.’17 departure from Oct. 19 P -1’4 -1’5 -1’3 -0’9 -0’7 -1’1 -2’1 -3’1 -3’2 -1’3 + 2’0 + 5’0 + 6’0 + 5’8 + 4’6 + 2’6 +ri + 0’4 -0’6 -1’6 -2’3 -2’3 -2’4 —1'9 14° 47'*7 Oct.’18 mean value for Oct. 1917 -1’5 -1'4 -1’1 -0’8 -0’8 -1’8 -3’5 -5’1 -4’7 —2’2 + 1’5 + 4’4 : + 5’5 1-5’5 + 4’5 + 2’9 + 2’1 + 1’3 + 0’5 -0’1 -0’7 1'2 -1’5 -1’8 14° 57'’5 Oct.’17 day) The day is counted from Oh. (midnight) to 2lh. (mi inight) G.M.T. Character “ 0” means a day wholly free from any but small disturbances. Character “ 1 ” means a day part or all of which is moderately or considerably disturbed.. Character