Marrin— Temperature Notes on the recent Eclipse of the Sun. 363 
thermometer fell 6°-4 after being in the shade for one minute, 
and the white fell 2°-7 in 
the same time. : 
SUIMYE AU] 
ssl | z 
On annexed figure are 2 
given two curves showing 4 
the comparison of the two | 
thermometers used. These 
were made by taking the =;— i eS 
lowest reading of each in- 
strument from each of the Z 
other readings. Thesums | om 
of these differences were | < <a 
taken, and the sum for ~ T=. 
the white bulb divided — 
into that for the black 
bulb, thus finding the 
factor necessary to reduce 
white to black. The dif- . 
ferences of the readings — 
of the white bulb from the 
lowest reading were then 
multiplied by this factor, 
andtheresultswereplotted | 
down. The thick curve 2 
refers to the white bulb, 
and the other curve to the 
black bulb. From these 
two curves it will be seen 
that, ifanything, the white 
bulb thermometer moved 
less quickly than the black, 
and is the least sensitive 
of the two instruments. 
08 3 
en ie 
088 
OF 
The temperature in - 
the meridian room was 
recorded on a_ thermo- 
graph, but owing to the _ 
small scale of the sheet, 23 S = = 
no difference of temperature was noticeable. 
0€ F 
0S’? 
