31 
2. Lufttryk. 2. Atmospheric Pressure. 
Til Expeditionen anskaftedes to Søbarometre af Adie For the Norwegian North-Atlantic Expedition two 
i London. De bleve veriticerede ved Observatoriet i Kew, marine barometers were procured, by Adie of London. 
hvor der fandtes folgende Correctioner: They were verified at the Kew Observatory, and the fol- 
å lowing corrections found: — 
Correction ved (at) FACE Me On 740" 750"™ FSR Owe oun 
Adie 1493 pa, Ong — © ii Gio — 0.10” — oQ.107m 2= 0.057 as Oro SJAL — 90.00” 
» 1494 — 0.25 1— 0.25 — 0.25 — 0.20 — 0.20 — 0.20 — 0.20 
I Løbet af Vaaren 1876 sammenlignedes begge disse | In the spring of 1876, both these barometers were 
Barometre paa det meteorologiske Institut i Christiania med | compared with the standard barometer! of the Meteoro- 
dettes Normalbarometer,! hvis Correction til sand Barometer- | logical Institute in Christiania, the correction of the latter 
højde antages at vere + 0.”"18. Kun Barometret Adie instrument to true barometric pressure being taken at 
1493 kom til Anvendelse paa Expeditionen, medens 1494 + 0.”"18. Barometer Adie No. 1493 only was made use 
tjente som Reserve. Den sidste Række Sammenligninger i | of on the Expedition, No. 1494 serving as a reserve in- 
Christiania gav følgende Resultater. | strument. The last series of comparisons undertaken in 
| Christiania gave the following results: — 
Dag (Day). Lufttryk (Pressure). Correction for Adie No. 1493. 
1876. - Marts 21 MOOug 1 — 0.447" 
21 BOG 0100 
22 56.5 = O54 
23 48.6 SOMA 
24 53:8 tome 
2 60.5 — 0.49 
27 55-1 — 0.41 
30 51.0 — O20 
31 BEG — 0.42 
Middel (Mean). 755-7 — 0.45 
Middelfejl af en enkelt Sammenligning (MF) = + The mean error of a single comparison (MF) = + 
O.7™07, O.7707, 
For Adie 1494 fandtes paa samme Tid Correctionen For Adie No. 1494, the correction was simultaneonsly 
= — 0.""59 med en Middelfejl af en enkelt Sammenlig- found = — 0.”"59, with a mean error for a single com- 
mine == sb OPA | Drison = sp OP, 
Vore Correctioner ere saaledes henimod — 0.””4 for- 
skjellige fra Kew-Correctionerne. 
Tidligere Sammenligninger Vinteren 1875—1876 i 
Christiania tydede hen paa, at Correctionerne ved lavere 
Lufttryk vare mindre end — 0.45. Hertil er ved Ob- | 
servationernes Reduction i 1876 taget Hensyn, idet Correc- | 
tionen ved 740” er regnet lig — 0.2. 
Barometret Adie 1493 ophængtes ombord i * Vøringen” 
i Arbejdssalonen, midtskibs. paa Forskuddet. Det havde 
der en sikker Plads, bekvem for Observation og med godt 
Lys fra Skylightet foroven. Denne Plads (Fig. 4, x) beholdt 
* Om dettes Correction se Jahrbuch des norwegischen meteo- 
rologischen Instituts fiir 1874, Vorwort S. 1. 
Our corrections differ accordingly about — 0.””4 from 
the Kew corrections. 
Previous comparisons, undertaken during the winter 
1875 —1876, were such as to indicate, that the corrections 
at lower atmospheric pressure were less than — 0.7”45. 
To this circumstance regard was had in 1876, the correc- 
tion for 740”” having been put equal to — 0.772, 
Barometer Adie No. 1493 was mounted in the work- 
room of the *Vøringen,” amidships on the fore bulkhead. 
There it had a secure position, was easy to observe, and was 
well lighted from above through the skylight. This place 
1 Tn regard to the correction of this intrument, see “Jahrbuch 
des norwegischen Instituts” fiir 1874, Vorwort, S. 1. 
