FEBRUARY, 1916. MONTHLY WEATHER REVIEW. 63
TABLE 2.-Vupor pressure at pyrliehiwtric Rtcitions on days when soltir radiation intensities icere .iimstired.
WmMngbn, D. C. (1 Madison, Wis. 11 Lincoln, Nebr. Santa Fe. N. Mex.
II -
Date.
- ima Feb. 3 7 14 15 16 19
n !a %
-
-
I8.m
Afm. 2.62 3.81
a 91 0. ga 2.16 1.24 2.16 3.30 1.32
-
-
--
#p.m. Date.
Afm. 1916. 1.89 Feb.1 1.12 2 1.12 7 2.49 13 2.87 27 1 .a 29 1.15 2. 49 1.45
- .-
-
I a.m
bfm. 0.68 0.53 0.36 0.86 1.12 1.32
-
0.51 1.07 13 0 66
1.32 1 I4 I 1152
29 I 1.68
;p.m Date.
1916. Feh. 1 3
i
1.52 I 2162 3.30 4 ?.lip 2.4Y 3.15 3.00 4.17 3.30 1.M 2.26 2.62 3.15 3.15 2.49 2.Si
2.57 3.00

TABLE 3.-Daily totals and Qyartures qf sokar and skg radiutiun nt Wash- ington, D. C., clitring Febritory, 1916.
[Qramealories per square centimeter of horizontal surfwe.]
Date.
Feb.
1016.
1.. .............................................. 2.. .............................................. 3.. .............................................. 4.. .............................................. 5.. .............................................. 6.. .............................................. 7.. .............................................. 8.. .............................................. 9.. .............................................. 10.. ..............................................
Feb.ll ................................................ 12.. .............................................. 13.. .............................................. 14.. .............................................. 15.. .............................................. 16.. .............................................. 17.. .............................................. 18.. .............................................. 19.. .............................................. 110.. ..............................................
D d e departure.. ....................................
Fob. 81.. .............................................. la.. .............................................. 23.. .............................................. 21.. .............................................. %. ............................................... %.. .............................................. 27.. .............................................. %. ............................................... 18.. ..............................................
Decade departure.. ...................................
Gramcalories Per cent.. .{ ........ ~efldency sla~e b t of yew.. .....
Daily totals.
Q r A . 36 21 2x3 313 199 2x3
Z31
3?7 275
210
5s 34 405
3S1 3x3 260
210 382 331
2.1 a
. - . . - . - . - ,
431
295 199 12
tis 321 2i3 4 25
265
.........
......... . -. . -. -. .
_-
Depar- ture from iormal.
-
(h.-aal. -167
- 1&5 74 100
- 17 13 IS 3 -19.1 3s
- 31 -187 -215 152 121 48 -4
- 57 111 57
........
156 14
- LsG -2iK
-2% 3
- 25
121
- IY
........
........ ........
--
Lmesss or de5ri-
smce first of month.
epcy
(Jrd?al. -167 -352
-27s -175
- 195 -1s2
-104 - llil -3 s
-3li
-315 -535
-i50 -59s -474 -4% -430 -1% -376 -319
-2
-1W -149
-211 -734 -7Iw
- i33
--RJ!I
-;as
-389
1,139 8.8
-g35
Table 3 shows t h t , at Washingdon the totnl solar nnd sky radiation was hclow t h nornid iluring the first m d
third decades of February. Tlic dcfcicmcy for the nio1 tth
, is 9.6 per cent of the svorngc February totd rr~tliation, tind
the deficiency siiicc thc iirst of the year is S.S per cmt of
the average aniount of radintion reccivid in hiuary ;L I ~
February. At Washington, therefore, wliilc tJiorn WCR iiiorc than
the average amount of clourliiicss during Fcl!r.unry, whm
the sky was clear the solar radiation was of average in- tensity. At Madison, Lincoln, and Santa Fe it was above its average intensity.
METEOR OBSERVATIONS.
Lchoratory of tho Eastnian Kodak Co.! Rochester, N. Y.; as also suggestions for a less desirable but simpler form for the general use of those interested in the subject. Having no funds at his disposal, he has urged the Kodak
Co. to construct n few copies and put them on the mar- ket, so that the world may realize the importance of the work. It is not likelv that I shall be able to contribute much more to this study, but I hope the Astronomical Society will stimulate some abler membor to devote himself to
this important and physic$ study.
., . -/, .; rr
The report concludes as follows:
P
. . J..
d
AREQUIPA PYR;HELIOMETRY.
(Summarized for tho REVIEW.)
This paper is a suniiiiar of observations taken a t the station of the Hnrvarcl Co H ege Observatory at Arequipa, Peru (4 ~1 6 ~ 22 28.0 S.; X=4h 46 11.738 W.; alt. 2,451 m.) by its observers, wit.h a Smithsonian silver- disk pyrheliometer lent for the purpose b the Smithson-
the Astrophysical Observator of the Sniithsonian Insti-
Huniidity determinations were niade sonietimes by means
of whirled wet- nnd dry-bulb thermometers, sometimes by t.he recording hair-hygromet.er. Month1 mean values are given in the authors Table 3,
e intensity of solar radiation at air mass 1.2 (suns zenith distance, z , 2 4 O , sec. z= 1.2).
a. 2, the transmission coefficient, computed from nieas- ureiiieiits of rncliatioii intensity with sun a t z=60 and
z = oo. p , pressure of aqueous vapor.
c , ciiipirical solar const.ant, coinputed by formula I and I1 given below.
ti, nuniber of days on which radiation was observed. The iiieans inclosed by parentheses are based on very meager data.
ian Institution. The observations have is een reduced a t
tutioii under the direction o 9 its director, C!. G. Abbot.
which is P iere reprinted, for the following elenients:
.
-
1 -4bhd, C. 0. Armluip:r pyrhellometrv. Washington, 1916. 23p. 2 figs. So.
(Smit.hsuiiian mise. COIL, v. d:, 110.9. mbi. 2367.)