290 
LITTLEHALES. 
Lat. 24° 38 / N. MAGDALENA BAY, LOWER CALIFORNIA. Long. 112° 07'W. 
Year. 
Magnetic 
declina- 
Authority. 
tion. 
Observei 
Where recorded. 
1783.3 .... 
o 
— 6.78 
Coast and Geodetic Survey Appendix, No. 7, 
Report for 1888, p. 273. 
1837. 
— 8.28 
La Venus 
Phil. Trans. Royal Society, 1875. 
Do. 
1839. 
— 9.25 
Belcher .. 
1866. 
— 10.68 
Harkness 
Smithsonian Contributions to Knowledge, No. 
239, 1873. 
1871.3 .... 
— 11.00 
G. Bradford, assistant. Coast 
Chart in Coast Survey archives. 
and Geodetic Survey. 
f W. Eimbeck, assistant,Coast 
1 
1873.3 .... 
—10.56 
J and Geodetic Survey. 
1 Commander G. Dewey, U. 
[Appendix No. 13, Coast and Geodetic Survey 
f Rep., 1882'. 
i S. N. 
J 
1881.2 .... 
—10.48 
Lieut. Commander !I. E. 
Coast and Geodetic Survey Appendix, No. 7, 
Nichols 
, U. S. N. 
Report for 1888, p. 273. 
Year. 
Observed. 
Computed. 
o-c. 
——2 
O-C . 
1783.3 .... 
o 
— 6.78 
o 
— 5.77 
— 1.01 
1.020 
1 
1837. 
— 8.28 
— 9.54 
+1.26 
1.588 
1839. 
— 9.25 
— 9.72 
+0.47 
0.221 
Probable eiTor of a single observation = ± 35'. 
1866... 
— 10.68 
—10.58 
— 0.10 
0.010 
Period = 252 years. 
1871.3 .... 
— 11.00 
—10.59 
—0.41 
0.168 
1873.3 .... 
—10.56 
—10.58 
+ 0.02 
0.000 
1881.2 .... 
—10.48 
—10.47 
— 0.01 
0.000 
| 
3.007 
Empirical equation for determining the declination for any year: v — — 7°.484 
— 1.469 sin ^ (<— 1850) — 2.739 cos y 0 — 1850). 
