366 H. A, Hazen—Thermometer Exposure. 
locality for exposing a thermometer, table I is eto hd 
_shows temperature and humidity at "various places in Wash- 
ington, . (These and many other experiments have been 
tried and introduced in this paper since its original presenta- 
tion to the amine Society). 
Tas.e I. 
Date. Time. Locality. Dry. Wet. |R. H./Dist.fr’m Root. 
1883. 
Nov. 17, 6.45 P. M. Roof. , 36-1 | 29°5 | 41 |, 
6.60: > * Hae 36°7 29°5 | 44 
6.00-.:"* Ro 3p'6 29:2 42 
hdl Pa. av. oa 1th a 35°0 | 28-3.) 39 } block. 
Pa. av. and 164 st 33°1 | 27-5 " 
T5pe; © nd 15th st. 4°0 27-6 | 40 34 blocks. 
K and he . $3°9° | 29b. 1 30 | SN 
M and 15th s 329 | 273 | 45 | 6 “ 
R. Island av. and fai st. | 303 | 25°9 | 53 yaa 
‘P and 15th st. 306. 1° 261:. 7) 63-1.9)5: 25 
S148 Q and 15th st. 29°9 25°6 | 54 | 10 is 
Corcoran fo 15th st. 19:5 1. 264.7 6T 4 1b 
=14 mile. 
Nov. 19, 6.45 P. M. Roof. 482 | 41:0 | 48 
ET a, Roof. 48°1 41:0 | 49. 
115 On ground. 44°5 | 38°5 | 53 
Pa. av. and 164 st. 42°6 373 56 
h st. 23 ars 58 
L306 * L and 16th st. 39°9 35'9 | 64’ 
Sst. 38°8 35°1 66 
Coreoran and 16th st. 38:3 | 34:9 | 68 
$.00;. + R and 16th st. 36°9 34°0 | Tl 
Corcoran and 15th st. 37°8 34°7 71 
Nov. 20, 6.30 a. M.} Corcoran and 16th st. 31-4 | 303 | 88 
P and 16th st. 31i°9 30°4 , 84 
M and 16th st. 32°0 30°4 | 83 
H and 16th st. Bay 80°38 [83 
Pa. av. and 17th st. 33°1 81°3 | 82 
Tse Roof. 35°9 32°8 | 70 
7.08. Roof. 363 | 33:1 | 69 | 
PO ees 
ence of 23 per cent in the relative aia The cule are 
not strictly comparable owing to the difference in time between 
the observations, yet as the temperature was changing but 
slowly this consideration can have little weight. Experiments 
are still under way relative to this matter. 
pe, 
tote: up now the second division of the subject, we Baia | Oe: 
the necessity of an uniform and satisfactory shelter 
for thermometers has long been recognized. The tematioal a 
i 
