514 FIRST REPORT UPON MAGNETIC WORK

A.—To refer the above times to any year subsequent to the tabular
year (1897) ADD to the tabular quantities.¹

		Minutes.		Minutes.
	For year 1897	0.0	For year 1905	7.1
	1898	1.5	1906	8.4
	1899	3.0	1907	9.8
	1900	4.3	1908	11.1 Up to March 1.
	1901	5.5		7.2 On and after March 1.
	1902	6.9	1909	8.6
	1903	8.3	1910	9.9
	1904	9.7	Up to March 1.
		5.8	On and after March 1.

B.—To refer to any calendar day other than the -first and fifteenth
of each month, SUBTRACT the quantities below from PRECEDING DATE
or ADD when working from the FOLLOWING DATE.

	Day	of month.	Minutes.	No. of days elapsed.
	2	or 16,	3.9	1
	3	17,	7.9	2
	4	18,	11.8	3
	5	19,	15.8	4
	6	20,	19.7	5
	7	21,	23.6	6
	8	22,	27.6	7
	9	23,	31.5	8
	10	24,	35.5	9
	11	25,	39.4	10
	12	26,	43.3	11
	13	27,	47.3	12
	14	28,	51.2	13
		29,	55.2	14
		30,	59.1	15
		31,	63.0	16

C.—To refer the table to Eastern or Standard time and to the civil
or common method of reckoning:

(a) ADD to the tabular quantities a correction at the rate of four
minutes for every degree longitude west of the 75th meridian, that is,
apply a correction as obtained from the formula,

correction (in minutes) = 4(1—75°),

¹ The corrections up to 1905 were specially furnished by the Coast and
Geodetic Survey. With the aid of these corrections I was able to extend
the table to 1910.—L. A. B.