Square of 475 varas equals JL section equals 

 40 acres. 



To find the number of acres in any number 

 of square varas, multiply the latter by 177 

 (or to be more exact, by 1771), and cut off 

 six decimals. 



San Antonio, Texas, variation in 1904, 

 8 3' +3.1. 



MAGNETIC DECLINATIONS. 



Variations of the compass for the Epoch 

 January, 1904: 



With the annual change from 1900 to f90. 

 for the principal places in the United States. 



A ( + ) sign denotes West Declinations; 

 a minus ( ) sign East Declinations. For 

 the annual change a plus sign denotes in- 

 creasing West or decreasing East Decli- 

 nation, and a minus sign the reverse. 

 (Part of reports of the United States Coast 

 and Geodetic Survey given.) 



Variation Annual 

 Jan., 1904 Change 



Sitka, Alaska 29 53' O'.O" 



Olympia, Wash 22 41 0.0 



Portland, Oregon 22 32 0.0 



San Francisco, Cal 16 42 0.0 



Madison, Wis 4 57 -f5.0 



Portland, Maine +14 32 +1.3 



Columbia, S. C 12 +3.1 



Demarcation Point, Alas. 39 50 +10 .0 



Philippines, Manila 52 1.0 



THE MAGNETIC POLE. 



In a lecture at Glasgow, by Professor 

 Thompson, he stated that the magnetic pole 

 is at present near Boothia Felix, more than 

 1000 miles to the west of the geographical 

 pole. 



In 1557 the position of the needles showed 

 the magnetic pole to be due north. It had 

 been eastward before that; it then began to 

 point westward, and this ^yestwa^d variation 

 continued to increase until 1816, when the 

 maximum was attained; it has since steadily 

 diminished, and in 1976 it will again point 

 to the true north. 



38 



