292 THE MAGNETIC DECLINATION IN CECIL COUNTY 



TABLE II. 



Mouth. 6 



A.M. 



January —0.1 



February*. +0.6 



March +1.2 



April +2.5 



Mav +3.0 



June +2.9 



July +3.1 



August + 2.9 



September. . . . + 1.8 



October -j-0.5 



November.... +0.5 

 December .... +0.2 



9 



10 



11 



+ 0.2 



+0.7 



+ 2.0 

 + 3.1 

 + 3.8 

 + 4.4 

 + 4.6 

 -4.9 

 + 2.8 

 + 1.6 

 + 1.2 

 + 0.3 



+ 1.0 



+ 1.5 

 + 3.0 

 + 3.4 

 + 3.9 



+ 4.4 

 + 4.9 

 -5.4 

 -3.4 

 + 3.1 

 + 1.7 

 + 0.8 



-•2.1 

 + 1.9 

 + 2.8 

 + 2.6 

 + 2.6 

 -3.3 

 + 3.9 

 -3.7 

 -2.5 

 + 2.8 

 + 1.8 

 + 1.8 



+ 2.4 

 + 1.4- 

 + 1.6- 

 + 0.8 

 + 0.1- 

 + 1.1 

 + 1.8- 

 -0.4 

 + 0-3 

 + 1.4 

 + 1.1 

 + 1.8 



1.2- 



■0.1 

 ■0.6 

 ■2.1 ■ 

 ■2.4 

 ■2.0 

 -1.2 

 ■2.8 

 -2 7 

 -1.0 

 -0.5 

 0.0 



1.1 



1.5 

 2.5 

 4.0 

 4.0 

 3.6 

 •3.4 

 •4.7' 

 4.4 

 •2.7 

 2.0 

 1.6 



■SJ.5- 

 -2.1- 

 -3.4 



■4.1 ■ 



-5.0 



■4.5 



-4.4 



-5.1 



-4.6 



-3.3 



-2 7 



-2.4 



2.6 



-2.1 



2.5 



-2.0 



3.7 



— 3.3 



4.2 



-3.6 



4.5 



-3.6 



4.5 



-3.8 



4.7 



-4.2 



4.9 



-3.7 



4.2 



-4.0 



3.4 



-2.4 



2.6 



-l.S 



2.3 



-1.8 



■1.3—0. 

 -1.2-0, 

 ■2.3—1. 

 ■2.3-1. 

 -2.3-0. 

 ■2.6-1. 

 -2.8-1, 

 -1.9-0. 

 -1.4-0. 

 •1.3-0, 

 -1.0—0, 

 -1.1-0, 



6 



P. M. 



2 -0.2 

 8-0.4 

 2—0.5 

 2-0.2 

 9 +0.1 

 2—0.2 

 3-0.3 

 6 +0.3 

 3—0.1 

 4-0.4 

 2+0.2 



3 -0.1 



Tliis table shows that during August, for example, the magnetic 

 declination has its lowest value about 8 a. m. and its highest value at 

 about 1 p. m., and that between these two hours the needle changes 

 its direction about 10', which amounts to 15 feet per mile. In 

 winter the change is considerably less. 



Table III shows how the magnetic declination has changed at 

 Elkton between 1700 and 1900. 



TABLE III. 



Tear 



Needle 



Tear 



Needle 



Tear 



Needle 



Tear 



Needle 



Jan. 1. 



pointed. 



Jan. 1. 



pointed. 



Jan. 1. 



pointed. 



Jan. 1. 



pointed. 



1700 



5°30'W 



1750 



2°30'W 



1800 



0°02'W 



1S50 



2°01'W 



10 



5 05 



60 



1 44 



10 



07 



60 



2 42 



20 



4 34 



70 



1 05 



20 



24 



70 



3 24 



30 



3 58 



80 



31 



30 



50 



SO 



4 09 



40 



3 17 



90 



12 



40 



1 25 



90 



4 50 



50 



2 30 W 



1S00 



02 W 



50 



2 01 W 



1900 



5 21 W 



From this table it will be noticed that the needle is at the present 

 time pointing about the same amount to the west that it did two 

 centuries ago, and that in about 1800 the magnetic declination was 

 practically zero, that is, the magnetic needle pointed exactly to the 

 true north pole. "What the change of 5|-° in a century in the point- 

 ing of a magnetic needle implies may be readily understood from the 

 following statement: 



