478 . REPORT—1862, 
Taste IX. (continued.) 
Between 19,000 and 20,000 feet. 
Dew-point Temperature of the Dew-point as deter- 
Temperatures mined by 
Dry and Wet | 5 
Calculated Observed Dry and Wet (free) (aspirated) 2 
4 from by above that by i that by g ee 
Date. Height. ae ea 6 ae 
=./8¢| Bled ee| & 28| §| 28 Hoe 
ge] 38/281 38 | ge |42| 22 |S8 | 3a [S82 
sé | Fa | 6) 26] 22 | 26| Be | 28] sale 
¥ a| 3 Ba | 8 >| & g 
& | S| ae] se) &| ae) en | ae | 2 lé 
d h m feet. ° ° ° ° ° ° ° ° ° ° 
July 17 10 27 |19374 25°6| 23°2| 22°6| 21°0 ||+2'4/+3:0|4+4'6 |4+0°6 |42°2 |4+ 16 
IO 29 |19415 19°5| 214 22°2 ||—I'g| +». |—2°7] -» |—o'8 
IO 30 |19415 21°8) 18°3| 2175) 22°2 ||-4+-3°5 |+0°3 |—0'4 |—3°2 |—3'9 |—0'7 
IO 35 |19548 16°6| .. 190} 20°0 || «. |—24)—3°4| .. es |—1'0 
IO 39 |19380 23°83] .. 20°O| 21'r || -- |4+3°8)/42°7| .. oo |—I'E 
IO 44 119336 22°1| 22°1| 20°] 20°5 || o'0|+1°6|4+1°6|4+16)/41'6| oo 
Sept: 5 1 37$)19000+/—13'0| .. ~ 10° an +» |—3°0 
wan” : Between 20,000 and 21,000 feet. aie Ee 
Sept. § 1 goapocco+|—e2] .. |. [as] | [een] | |_| 
By taking the mean of each column of differences in each 1000 feet of 
elevation, the next Table is formed. 
Taste X.—Showing the mean differences between the Temperatures of the 
_ Dew-point as found by the use of the Dry- and Wet-bulb Thermometers 
and by Daniell’s and Regnault’s Hygrometers, and comparison of the results 
as found from the two Hygrometers. 
Excess of Temperature of the Dew-point as found by 
Dry and Wet Thermometers (free) || Dry and Wet (aspirated)|| 
above that found by above that found by 
Heights between ae a 
Sols} 8 lal 28 [el 3 Vs] 28 lel 28 
42 |2| 22 |2| 22 |] $2 |2] Ze [Sil SE 
S38 lw as is BS | as |e] 325 oe aS 
an | 6} & iS) ih S ° = 
p 3is| 2 |s| SE is] EE] s) BE | 5) BE 
A Zz) am |4] ea j2t Am 12) mist we 
feet. feet. < iM shat 
+41 | 8) -+2°6 |2/|/+0'2 |2) +2°6 |2 
--| 4-0°2 | 7 
+05 
+11 
.| —0°6 
