137 
6. Havvandets Tethed. 
Til Beregningen af Trykket i et Punkt i Havets Dyb 
maa man kjende Havvandets specifiske Vægt i de højere 
liggende Punkter i samme Verticallinie, henført til den 
stedfindende Temperatur rent Vand af 4° C. 
benævner denne Størrelse for Kortheds Skyld Havvandets 
og Jeg 
Tæthed. 
For at reducere Havvandets specifiske Vægt ved 
1795 OC, henført til rent Vand af samme Temperatur, 
3 17°.5 : 
hvilken betegnes ved S 705 08 er den, ‘som er fremstillet. 
Tversnit, til 
0 
Å 5 t 
dets Tæthed ved Temperaturen 09, hvilken jeg kalder S gi 
i de i forrige Stykke beskrevne Karter og 
har jeg gaaet frem paa følgende Maade. 
Kaldes den specifiske Vægt S, Volumet af rent Vand 
V, af Havvandet v, og betegner Tælleren i de vedføjede 
Brøker den stedfindende Temperatur, Nævneren Tempera- 
turen af det rene Vand, til hvilket den specifiske Vægt 
henføres, saa har man 
attempt, of due interest, and well calculated to serve as 
the basis of further computations. 
6. Density of the Sea-Water. 
To compute the pressure at a point in the depth of 
the sea, we must know the specific gravity of the sea- 
water at the higher-lying points in the same vertical line, 
| referred to the existing temperature and to pure water of 
40 C. TI call this quantity, for the sake of brevity, Density 
of Sea-water. 
For reducing the specific gravity of sea-water at 
| 1795 C, as referred to pure water of the same temperature, 
UUS) 
| denoted by S 
105) and which is that represented in the 
maps and sections described in the former chapter, to its 
f° 
40? 
course to the following mode of procedure. 
| If we term the specific gravity S, the volume of 
pure water V, of sea-water v, and if the numerators of the 
subjoined fractions indicate the existing temperature, the 
denominators the temperature of the pure water to which 
the specific gravity is referred, we have 
density at temperature 7°, which I call S—, I have had re- 
g ih — gl75 Va. gl a g 18, Sup 5 LAG: gn. Vai Us” Ve 
Ah 17,5 Vizs å 4 Op 17.5 Vits Oy 17.5 Vizs Vo Vi 
V, 0.9998829 : EE N 
Efter (According to) Broch! er Vi = 90128 — 0.998740; log = 9.994526. 
. Vi7.5 ror 
Efter (According to) Tornøe* er — = ICOAoll. 
t , Uw 5 AE Vo Pe UUS 17.5 Vo , LCS 
Altsaa (Hence) S Å == S 175 x 0.998740 x< 1.00261 i, = 1.00134683. am S 175 == S 175 
at Nt . Ve * 
EE TL _ Vo ay WH vo 17.5 
S i= S we or Correction; Corr. = S ot ae S Ti = a Er —1| Sms ca — “| 5 S 195 
5 O as G | > Oe , 0 ; 
Storrelsen af = findes i Tornøes Tabel. Den ffol- The value of aus given in Tornøe's Table. The fol- 
oO 
gende Correctionstabel er beregnet for en Saltholdighed af 
3.5 Procent, hvilket ifølge Tornøe giver 
17.5 
WS) 
17.5 
NG) 
S — | = = 0020088 aller Se = 026580 
og kan bruges for alle forekommende Verdier af S. 
1 Travaux et 
Volume et Poids spécifique de Veau pure. 
mémoires du bureau international des poids et mesures. 
2 be So HL. 
Den norske Nordhavsexpedition. H. Mohn: 
Nordhavets Dybder, Temperatur og Strømninger. 
oO 
lowing Table of Correction has been computed for a pro- 
portion of salt = 3.5 per cent., which, according to Tornge, 
| gives 
LT) 3.5 VE aoe , NYA) NE es 
S === — 1 = FS = 0.026536 or S == E= 1.026536. 
| TD) 131.9 NU 
| 
| and admits of being applied for all occurring values of S. 
1 Volume et Poids spécifique de leau pure. Travaux et 
mémoires du bureau international des poids et mesures. 
? Chemistry, p. 52. 
18 
