ABSTRACTS FOR THE HorIzONTAL ForcE. 141 
TABLE IX.—The Monthly Means of the Bifilar Magnetometer Scale Readings, Corrected by a new value of q, 
for the Hours 20, 23, 2, and 5. 
Approximate 
Month. 20%, 23h, 2h, Bh, eset eae Daily 
‘our Hours, Range. 
r 1841. Se. Div. Se. Div. Se. Diy. Se. Div. Se. Diy. Se. Diy. 
‘ July 457-45 450-82 470-26 482-54 31-72 
; August 516-26 515-87 526-92 535-81 523-71 19-94 
, 584-79 530-26 543-78 547-35 
f, September 550°63 542-24 562-51 57917 \ 
i 547-19 540-24 558-76 572-54 554-68 32-30 
, 47501 474:17 483-07 494-02 
%, October 487-27 486-08 506-50 499-04 \ 
480-26 480-12 494-22 496-41 487-75 16-29 
November 496-56 492-98 500-73 501-21 497-87 8.23 
1842. 
January 509-23 505-80 513-00 512-05 510-02 7:20 
February 508-33 505-02 512-47 515-60 510-35 10-58 
March 509-69 503-78 514-81 520-74 512-25 16-96 
April 501-46 497-49 512-46 523-95 508-84 26-46 
May 512-82 507-53 519-52 527-10 516-74 19-57 
June 512-32 507-81 521-90 531-11 518-28 23-30 
July 507-23 505-82 525-56 532-15 517-69 26:33 
August 512-29 507-27 524-26 530-58 518-60 23-31 
September 517-88 509-94 524-98 528-64 520-36 18-70 
October 524-91 517-14 528-01 529-90 524-99 12-76 
November 526-42 523.32 530-49 530-86 527-77 7-54 
December 532-20 530-22 534-37 533-79 532-64 4:15 
The small type in September and October 1841 is explained for Table VII. 
The following Tables for the Horizontal force are corrected by the new value of q. 
The rule given after Table I. for the days of irregularity to be rejected, having been applied, the following 
_ Table has been formed. 
_ TABLE X.—The Monthly Means of the Bifilar Magnetometer Scale Readings, as Corrected in Table VIII., and 
rejecting days of marked disturbance. 
Mean of the || Range from the 
h. 5 23h, : Fi 8 
Bont Four Hours. Four Hours. 
1841. Se. Div. Sc. Diy. 
July 25-20 
August 524-68 22-24 
September 550-40 21-60 
October 486-67 12-19 
November 498-81 5-91 
1842. 
January 510-10 7-81 
February 509-76 10-25 
March 512-20 15-75 
April 510-71 21-71 
May 516-64 18-45 
June 518-52 22-14 
MAG. AND MET. OBS. VOL. I. 2N 
