508 THE COLLIERY GUARDIAN September 6, 1918. MEAN MAGNETIC DECLINATION at Kew Observatory, Richmond, in Degrees and Minutes, for each Two-hour Interval in the Week August 25 to 31, 1918. Magnetic character. Intervals—Hours G.M.T. 0h.-2h. 14° + 2h.-4h. 14° + 4h.-6h. 14° + 6h.-8h. 14° + 8h.-10h. 14° + 10h.-12h 14° + 12h.-14h. 14° + 14h.-16h. 14° + 16h.-18h. 14° + 18h.-20h. 14° + 20h.-22h. 14° + 22h.-24h. 14° + Mean for day. 14° + Min. Min. Min. Min. Min. Min. Min. Min. Min. Min. Min. Min. ’ Min. Sun., Aug. 25 2 46*5* 49’0* 44’0 43’0 48’5 54’0 59’5 58'5 53'0 50'5 49’5 47'0 50’0 Mon., „ 26 1 45’5 50’5 46’5 46’0 46’0 51’5 56’5 56'5 52’0 49'0 50’0 46'5 50’0 Tues., „ 27 1 46*5 ♦ 47’5 49’0 48’0 49’0 54’0 57’0 54'5 50’0 44'5 49'0 49'0 50’0 Wed., „ 28 1 48*0 46’5 46’5 44’0 45’0 52’0 56’5 54’5 50’5 48’5 48'0 48’0 49’0 Thurs., ,, 29 1 50’0 48’0 46’5 44’5 45’5 52’5 56’0 54'0 50’0 48'5 47’5 48'5 49’0 Friday, „ 30 0 48’5 48’0 45’5 43’0 44’0 50’0 55’0 53'0 49'5 48'5 47'5 46’0 48’0 Sat., „ 31 1 45’5 46’5 45’0 43’0 44’5 50’0 53'0 52'5 51’5 45'5 45'0 44’5 47'5 Mean value for Diurnal i n e- lh. 2h. 3h. 4h. 5h. 6h. 7h. 8h. 9h. lOh. llh. 12h. 13h. 14h. 15h. 16h. 17h. 18h. 19h. 20h. 21h. 22h. 23h. 24h. month. quality (i.e., Aug.1917 -1*5 -1’8 -1’7 -2’2 -3’6 -4’8 -5’4 -5’3 -3’6 -1’0 + 3’0 +6’5 + 8’5 +8’1 + 6’0 +3'4 + 0’8 -0’5 -0'7 -0'7 -0'8 -1’0 -1’0 -0’8 14° 58''3 Aug?17 departure from July 1918 -1-1 -1-3 -2’0 -2’7 -3’9 -5’2 —5’2 —4’7 -3’4 -1’1 + 2’1 +4’9 + 6’3 +6’5 + 5'6 +4'2 + 2’5 +1'2 + 0'1 -0’4 -0’3 -0’5 -0’7 -0'9 14° 50' '4 July ’18 mean value for July 1917 —0’2 -0’4 -0’3 -1’2 —3’3 -5’2 —6’5 —6’7 -5’6 -3’0 + 0’8 +4’6 + 7’1 +7’9 + 6'2 +3'9 + 1'7 0’0 -0’4 -0'1 + 0’2 +0'4 + 0’3 -0’1 14° 59'’I July’17 day) The day is counted from Oh. (midnight) to 2i h. (milnight) 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