ON FIVE BALLOON ASCENTS IN 1868. 499 
§ 7. CompartIson of THE TEMPERATURE OF THE DEW-POINT, AS DETERMINED BY 
DIFFERENT INSTRUMENTS. 
Taste [X.—Showing the Temperature of the Dew-point, as determined at 
about the same height by different instruments and methods, and compa- 
rison of the results together. 
Under 1000 feet. 
Temperature of the | 
Dew-point temperatures. dew-point as deter- 
mined by 
Calculated Observed Dry and Wet (free) 
Date. Height. from by above that by 
| |e] 2 | 28] 2/2 | 28 
z2 | ee |S2| 22] ge] S214 : 
pe | o@ | 2h] BB | -& | 2B] & 
& | #8 | Af | ae | &° | a2 | ge 
d h m1 feet.’ | _ Es “ é & a 
March 31 4 7 350 38°3 380 : + 03 
411 350 38°3 es 36-2 . + 21 
June -26 1 63 .... 45°9 es 48°9 | - |= 3:0 
Waly )ar R44) «ss 52°7 SGPC ies — 23 
4 45 see | 52°8 53°5| + ae! 
447 52°2 550} +s — 28 
4 51 514 54°) — 26 
3 760 50°9 5ro| os ‘ — o1 
21 | Bees 59°0 | 59°5 — os 
5 293] 948 611 Fo | — 04 
‘* Between 1000 and 2000 feet. 
March 31 4 18 | 1515. 292 | ++ ee goro|| .. -. |— 08 
July x1 7 133) 1876. 42°4.|  o- 44yo| .- -» |— 16 
715 | 1876 430) =- A3:5itmine a. |— O05 
7 164} 1776 ADT ats 43:0)|, te — 03 
7 19 1582 44°4. o. 4475) «0 +. |— OF 
720 | 1485 45°2| «> AS iw ey || se oo 
7 22 | 1290 46°4.| «- 45°5| « «+ [+ o'9 
7 263) 1029 48'0| .. ABs tes «2 |= 05 
| 7 273| #1119 466 480] «- oe J 14 | 
7 283) 1341 444) +s ayo} fs +» |= 076 
% 30% 12397 451) ss 4475) we 74° fr 06 
7 3Z'| 1096 | 45°5| + | 4570 + 05 
7 33) 1488 430) + 25 + 05 
7 46} 1580 45°38) « 4pro| 3k — 12 
747) 1483 | 470, +. 47°5| +s ee 05 
749'| 1483 49°4 oe ASG |) = oo [+ 14 
759) 1337 | 492) +» 48°5| -- or oF 
\ 7 523| 1145 AD°O| os 49°70] os oe o"0 
‘ 755 | 1000 §O'O |; a 500] se oe o"0 
3 7 563 1020 507 8% 50°5 » |+ o2 
7 57%) 1029 499 «+ 508] .. 7» |— o9 
8 4+ 1290 5070 o's Py ee [— 1°5 
21 5 15s] 1241 oe 58°0 oe |— 0°5 
