E = R 1 . cos ( 0 -f c 1 ) + R 2 . cos ( 20 -J-c 2 ) + R 3 cos ( 3 0+c 3 ). 
Extracted, from tlie Quarterly Journal of the Meteorological Society for January 1880. c ‘ The Diurnal Range of Atmospheric Pressure, 
by Robert Strachan, F.M.S. 
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of Edinburgh , Session 1881 - 82 . 
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