4BS0EPTI0N OF LIGHT IN GASEOUS MEDIA. 
405 
Tabi.e II. 
Station. 
Height 
above 
Mean 
baro¬ 
metric 
Short-wave radiation, A.<-610p. 
Long 
-wave radiation, 
A.> -610//. 
! 
1 
yfcjci- 
level. 
pressure, 
P- 
tan 6'. 
/?. 
N„. 
U. 
tan 6". 
P". 
II 
^ 1 
Potsdam .... 
metres. 
100 
mm. 
*752 
-00893 
-00904 
2-51 X 1019 
-105 
-0170 
-054 
1 
-32 j 
Washington . . 
10 
1763-7 
-01016 
-01011 
2-24x 1019 
-192 
-0277 
-088 
-32 : 
Mount Wilson . 
1780 
1617 
-00806 
-00994 
2 - 28 X 1019 
-032 
-00806 
-032 
-.32 i 
!Mount Whitney 
4420 
§446-7 
-00592 
-01003 
2-26 X 1019 
-032 
-00592 
-032 
-32 
Authorities ;— 
Constants of Atmospheric Scattering and Absorption. 
* The mean barometric pressure .at Potsdam is given by MTllee, Ioc. cif., p. 138. 
t The mean annual barometric pressure at Washington is taken from Bartholomew’s ‘Atlas of Meteorology,’ 1809. 
X The mean barometric pressure at Mount Wilson is not given explicitly in the ‘Annals.’ The value given in the above 
table is obtained by finding the reduction of pressure to sea-level corresponding to an elevation of 5886 feet (the air- 
temperature being taken at 60’ F.) from Hazen’s Tables. (‘ Professional Papers of the Signal Service,’ No. VI., 
Washington, 1882.) 
§ The barometric pressure at Mount TVhitney is obtained from observations given by Lakgley, September 2-6, 1881 
(Lakgley, “ Eesearches on Solar Heat: A Keport of the Mount Whitney Expedition,” ‘ Professional Papers of the 
Signal Service,’ No. XY., 1884.) 
Table III. 
c. 
0°. 
20°. 
0 
o 
j 
60°. 
70°. 
80°. 
0-00 
0-0000 
0-0000 
0-0000 
0-0000 
0-0000 
0-0000 
•05 
•0476 
• 0475 
•0472 
•0464 
•0443 
•0424 
-10 
•0905 
•0902 
•0891 
•0861 
•0813 
•0720 
-14 
•1217 
•1212 
•1191 
•1133 
•1072 
•0889 
-18 
•1502 
•1492 
•1461 
•1377 
•1270 
•1009 
-22 
•1766 
•1753 
•1708 
•1583 
• 1439 
•1093 
•26 
•2002 
•1985 
•1927 
•1761 
•1575 
•1150 
•30 
• 2220 
•2200 
•2136 
•1953 
•1749 
•1174 
•34 
•2420 
•2395 
•2298 
•2052 
•1776 
•1198 
•38 
•2600 
•2568 
•2450 
-2163 
•1844 
•1206 
•50 
• 303 
•298 
•280 
•238 
•1964 
•1154 
-60 
•329 
•323 
•301 
•248 
•1950 
•1090 
•70 
•348 
•340 
•313 
•250 
•1930 
-1006 
•80 
•359 
•350 
•318 
•247 
•1850 
•0923 
•90 
•366 
•356 
•320 
•241 
•1740 
•0856 
Table of the Function Ct: G {C (sec ^ - 1)}. 
