Astronomy and Geodesy. 479 
Radiation observations were taken during “is eclipse to deter- 
at propo! ar as cut off 
the author states: “An examination of the wba ars vd vd the 
results of the computation leads to the oe conclus 
(1 e readings of all the instruments were sndentially the 
same at the close of totality, and agreed with the observed air 
pron paral This indicates that during the total phase no heat 
was received by the earth from the atmosphere, as far as these 
; frist itaeite allowed its measurement. It need hardly be said 
that the radiation instruments are not intended to show the effect 
of the heat of the corona, and are not sensitive enough for such 
refined measurement. Their use : to measure the effect of heat 
which is received from the sun and by reflection from the atmos- 
phere—the heat which is a factor in causing vegetable growth ; 
ments. 
is at about 10.08 a> M., or four minutes after the first contact. 
This four minutes covers whatever tardiness the instruments pos- 
sess, as well as the natural increase of solar heat in the morning, 
until it was overbalanced by the ig cutting off of a portion of 
the sun’s heat. e minimum point of the curve is at about 
11.40 A. M., or three minutes after mg observed time of third con- 
tact. This time is somewhat uncertain, as from the nature of the 
case this portion of the curve is drawn ‘arbitrarily, the intensities 
i : econd 
afternoon observations do not Paw as great intensities as the 
morning, as is further indicated by the computed diathermancy 
agree given below. The “ was observed to be quite hazy 
ie 
trand, Row Yo bay there is a jie a8 of a new form of primar 
The apparatus might be ponatracted as fol Ws: easuring 
bar, a bar of steel 25™" in diameter and 6° i in aaa elas ina 
circular cast-steel tube 4" in diameter, made stiff by bracing, but 
as light as possible. Along the top of this tube slots of about 
75™" in width would be cut to allow the introduction of ice around 
the bar. The hole for drainage would be at the center of the tube 
on the under side. For supports during the measurement two 
