* 
376 H. A, Hazen—Thermometer Exposure. 
In the first series we find “ Pattern” giving a mean tempera- 
ture ‘4° lower than ‘“ Russian” with a mean relative humidity 
*8 per cent lower. In the second series we find the “ Pattern’ 
which is now twelve feet above roof giving “4° higher nies 
ture and a relative ee | 3°0 per cent lower. Taking th 
mean of the two series we find no difference in the compara 
while the “ Pattern” gives a relative humidity nearly 2°0 per 
cent lower 
The lack of ventilation in the Russian may be best shown 
by taking observations of the wet bulb when its temperature is 
below freezing. As shown in “ Science,” June 8th, 1883, it is _ 
under these conditions that ventilation is most needed. 
Table V exhibits individual readings of dry and wet ther- 
mometers. Ist, “fronde;” 2d, “ Russian ;” and 8d, “ Pattern.” 
Taste V.— near of dry and wet “fronde” with 
Russian and Pattern. 
a 
"Mean, omitting the four observations in which wet was higher than dry in Russian "i 
‘*Fronde,” 14 ft. | Russian, 16 ft. Pattern, 12 ft. Wea- 
a Sai ARSE: Sei Time. Wind. ther. 
Dry. | Wet. |R. H.| Dry.| Wet. R. H.| Dry. | Wet.|R. H. 
Nov. 13| 31-7] 26-3) 45 | 31°5}31-5| -. | 31-6] 26-9|52 | 7.23 a.m.| Calm. _|Clear. 
32-0| 26°7| 47 | 31-9] 31°41 95 | 32-3] 26-8] 44 | 7.31 “ ¥ 
32°8| 26°9| 42 | 32°9] 30°5| 75 | 33°2| 24-3143 | 7.44 ii 3 
34°4| 28-7] 47 | 34-7] 30°6| 62 | 35-1] 29°7/ 50 | 8°09 . 
Nov. 14 | 32-8) 26-4) 38 | 33°1| 27-1) 42 | 39-8 26-7| 40 | 7.03 p.m.| Brisk N.W.| © 
33°1| 26°3| 34 | 33-21 28-0) 49 | 32°9) 27-1|43 | 7.16- i : 
32-9] 26-2] 35 | 33°0| 27°3| 44 |32-7) 26-5|39 | 7.25 . 
Nov. 15 | 22-8] 20°4/ 68 | 23-0) 31-2) __ | 23-0 29-7|96 | 7.05 a.m.) Calm. : 
23°5| 20°7| 63 | 23°3}30°0| __ | 23-2! 21-2] 73. | 7.15 2 i 
23°8| 21-4168 | 23-5) 24-2] __ | 23-7) 21-7) 74 | 7.25 Light S. 
35:4 27-9 32 | 35:3) 30-4| 55 | 36-2| 31-8| 58. |11.03 a. m.|Light S.S.W. 
35°1| 28°5| 40 | 35°3| 31°6| 58 | 36-0) 29-6| 43 {11.19 “ 
35*1/ 28°1/ 36 | 35-4| 30-6! 56 | 36-6| 30°5| 46 {11.30 . un 
35:1) 28°2) 37 | 35:4) 30-1) 51 | 36-2! 29-8] 43 {11.35 " 
‘ 
Nov. 17} 4171) 31-7} 23 | 40°5| 33°3) 38 | 42-7, 33-2] 94 | 3.00Pe.m.| Calm. ; 
41-6 311/20 | 411/323 27 |41-4\31-7.21 | 3.17 [Light S.S.W. 
“ 
36°1| 29°65} 41 | 35°4! 30°6| 56 | 35-2/ 30°31} 54 | 6.45 P ‘a 
35°1| 29°56, 44 | 36°4| 30°4| 54 | 35-3) 3071/52 | 6.50 e is 
35°6| 29°2| 42 | 35-2] 30°3| 55 | 36°2) 30°1\ 53 | 6.55 ss 
Nov. 20 | 35-9 32°8| 70 | 35-0) 34-41 94 | 34-9' 33-9! 86 | 7.03 a.m] Calm. ‘i 
36°3] 33°1| 69 | 34°9| 33°3| 84 | 34-9) 33-0! 81 | 7.08 . i 
35°2| 32°7| 75 | 35°1| 33-4| 83 | 34°8| 33-2) 84 | 7.18 i me 
36°9| 33°1/ 72 | 35-3! 33-7] 86 | 35-2) 33-3| 81 | 7.30 n “ 
36°1| 33-4| 73 | 35°6| 33°8| 82 | 36-4| 33-6 81 | 7.35 : ee 
: ae 
Mean ._| 33°8| 28-3) 48°4/ 33°5/ 30-8] ___ | 33-8) 29-2| 56-7 
35°4| 29°5) bar 35°2) 31:2{ 62-3] 35-4! 30-4, 53°3 
| bona os es ey as 
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