METEOROLOGICAL OBSERVATIONS. 169 



1597, 1639, minimum thermometers; no doubt spirit thermometers. 



1663, 1704, both mercurial thermometers; the latter a black bulb. 



A, B, two Eeaumur thermometers. 



1644, 1648, hygrometric and black bulb thermometers. 



To allow for errors of graduation the following comparisons were made : — 



1. Comparisons of thermometers at the temperature of freezing water. Port 

 Foulke, Smith Strait, September 12, 1860. The thermometers were immersed in 

 a bucketful of melting ice. A. Sonntag, observer. The readings are taken at 

 intervals of five minutes. 



Number or designation of thermometers. 





3 



1 



2 



4 



5 



6 



7 



9 



1597 



1639 



1657 



1663 



1704 1705 



A 



JB 





32°.0 

 32.0 

 32.0 

 32.0 



31°.7 

 31.6 

 31.5 

 31.6 



32°.0 

 31.9 

 31.8 

 31.8 



31°.5 

 82.0 

 31.8 

 32.0 



31°.7 

 31.3 

 31.5 

 31.5 



31°.4 

 31.3 

 31.3 

 31.3 



31°.0 

 30.8 

 31.0 

 31.0 



31°.2 

 31.0 

 31.0 

 31.0 



31°.4 

 31.5 

 32.0 



32°. 3 

 32.2 

 31.7 

 32.2 



31°.2 

 31.2 

 31.5 

 31.3 



31°.5 

 31.4 

 32.0 

 31.7 



32°.0 

 32.0 

 31.5 



32°.0 

 32.0 

 32.0 

 32.0 



— 0°.3 

 —0.4 

 —0.3 

 —0.3 



0°.0 



—0.2 



0.0 



0.0 



Mean, 

 Corr'n, 



32.0 

 0.0 



31.6 

 +0.4 



31.9 

 +0.1 



31.8 

 +0.2 



31.5 

 +0.5 



31.3 



+0.7 



31.0 

 +1.0 



31.0 

 +1.0 



31.6 

 +0.4 



32.1 

 —0.1 



31.3 

 +0.7 



31.7 

 +0.3 



31.8 

 +0.2 



32.0 

 0.0 



—0.3 

 +0.3 



0.0 

 0.0 



2. Comparisons at low temperatures, Port Foulke. The thermometers were 

 suspended on the east side of the Port Foulke meteorological observatory, facing 

 northeast, and were readxat intervals of five minutes. March 24, 1861. 



Number or designation of thermometers. 





3 



1 



2 



4 



9 



10 



M 





— 37°.2 

 37 

 36.8 

 86.8 

 36.8 

 37 

 37 



— 42°.8 

 42.5 

 42.2 

 42.2 

 42 

 42.2 

 42.5 



—33°. 8 

 34.5 

 35 

 35.5 



— 32°.5 

 32.2 

 33 

 33.2 

 33.5 

 33.5 

 33.8 



— 32°.0 

 31.8 

 31.8 

 31.8 

 31.8 

 32.0 

 32.0 



—390 

 40 

 41.5 

 42 



— 35°.5 

 35.5 

 35 

 35.5 

 35 

 35.5 

 36 



Mean, 

 Correction, 



—37.0 

 0.0 



—42.3 

 + 5.3 



—34.7 

 — 2.3 



—33.1 

 — 3.9 



—31.9 



—40.6 

 + 3.6 



—35.4 

 _ 1.6 



The small correction of the metallic thermometer at this extremely low tempera- 

 ture is a satisfactory proof that the low temperatures are correctly ascertained. 



22 October, 1865. 



