594 



Tables 744 and 745 

 TABLE 744. — Total Magnetic Intensity, United States 



This table gives for the epoch January i , 1925, the values of total intensity, F, expressed 

 in c.g.s. units, corresponding to the longitudes in the heading and the latitudes in the first 

 column. 



TABLE 745. — Secular Change of Total Intensity, United States 



Values of total intensity in c.g.s. units for places designated by the latitudes and longitudes 

 in the first two columns for January 1 of the years in the heading. 



Long. 



1855 1865 1875 1885 1895 1900 1905 1910 1915 1920 



25 

 25 

 25 

 31 

 31 



3i 

 3i 

 37 

 37 



37 



37 

 37 

 43 

 43 

 43 



43 

 43 

 43 

 47 



47 



49 

 49 

 49 

 49 



80 

 90 

 100 

 80 

 90 



100 



no 



80 



90 



100 



no 

 120 



70 

 80 

 90 



100 

 no 

 120 



70 

 80 



90 

 100 

 no 

 120 



•5407 -5385 -5339 



5232 



5159 



■5792 .5781 .5749 

 .5786 .5749 -5697 



.5676 .5647 .5608 

 •5453 -5424 -5388 

 .6094 .6080 .6080 

 .6111 .6089 .6040 

 5922 



5722 



•5539 -5524 -5512 

 .6208 .6214 .6189 

 .6402 .6361 .6345 

 6341 



6269 



6091 



5842 



.6468 .6398 .6298 

 6575 .6486 



6561 



6498 



6245 



6075 



.5262 .5209 



.5210 .5137 



.5107 .5078 



.5657 .5606 



.5666 .5627 



•5570 -5543 



•5348 -5333 



•5977 -59io 



.6028 .5977 



.5889 .5863 



.5687 .5676 



•5484 -5474 



.6091 .6011 



.6287 .6201 



.6306 .6231 



.6224 .6190 



.6053 .6039 



.5818 .5806 



.6209 .6115 



.6417 .6298 



.6506 .6421 



.6441 .6389 



.6209 .6188 



.6051 .6028 



.5190 



•5"5 

 .5069 



•5589 

 •5613 



•5537 

 •5330 

 .5901 



•5977 

 •5863 



.5670 

 •5459 

 •5994 

 .6183 

 .6227 



.6191 

 .6030 



•5784 

 .6106 

 .6288 



.6408 

 •6385 

 .6178 

 .6009 



•5175 

 •5131 

 .5064 



•5575 

 .5604 



•5535 

 •5317 

 •5878 

 •5963 

 .5860 



•5657 

 •5437 

 .6005 

 .6166 

 .6217 



.6184 

 .6020 



•5767 

 .6126 

 .6289 



.6404 



•6377 

 .6172 



•5994 



•5170 

 •5134 

 •5051 

 •5554 

 •5602 



•55i6 

 •5291 

 •5851 

 •5947 

 •5838 



.5629 



•5414 

 .5962 

 .6136 

 .6194 



•6i55 

 •5985 

 •5740 

 .6100 

 .6244 



.6364 



•6334 

 .6129 



•5957 



•5136 

 •5107 

 •5025 

 •5496 

 •5557 



•5479 

 .5261 



•5790 

 •5889 

 •5795 



•5593 

 •538i 

 .5898 

 .6079 

 .6142 



.6110 



•5948 

 .5706 

 .6025 

 .6189 



.6310 

 .6283 

 .6087 

 •59i6 



.5102 

 .5070 

 .4990 

 •5456 

 •55i6 



•5439 

 •5225 

 •5739 

 .5848 

 ■5752 



•556o 



•5353 

 .5828 

 .6024 

 .6097 



.6072 

 •5917 

 •5673 

 •5947 

 .6132 



.6270 

 .6243 

 •6053 

 .5882 



.5081 



•5045 

 .4961 



•5434 

 .5488 



•5409 

 •5193 



•5707 

 .5814 



•5717 



•5525 

 •5326 

 .5780 

 ■598i 

 .6061 



.6034 



.5881 

 •5644 

 •5883 

 .6085 



.6241 

 .6212 

 .6019 

 .5851 



Smithsonian Tables 



