Er 1 oge’ Constanter, der udtrykke Havvandets Sammen- 
trykkelighed, 
p Trykket i Atmosfærer i Dybden h, 
saa har man (Se Side 148), 
| Let 7/ and &' be constants expressing the compressibility ot 
| sea-water ; 3 
| 
| 
p the pressure, in atmospheres, 
then we have (See page 148) 
at the depth h; 
Ci) = 
y/—e'p er altsaa Havvandets Sammentrykkeligheds- 
coefficient. Ved Integration findes, da p=0, naar h=0, 
og S varierer saa lidet med Dybden, at man kan regne 
med constant Å, 
v= 
do 3 (1 —f cos 2p) (1 + 7 h) 
Ua SG = B cos 2 (p) (1 as bh) dh 
se Oe 
7/-—é' p is accordingly the coefficient of compression 
for sea-water. Integrating, we find, as p=0 when h=0, 
| and S varies so little with depth as to admit of computing 
| with constant Å, 
b 
ar 
== (x 
2 
Det rene Vands Sammentrykkelighedscoefficient kan — 
ifølge Travaux et mémoires du bureau international des 
poids et mesures, Tome II, D, 30 fremstilles ved Formelen 
De! 
ETE 3 nt p) p 
| The coefficient of compression for pure water, may, 
according to Travaux et mémoires du bureau international 
| des poids et mesures, Tome II, D, 30, be expressed by 
| the formula 
yp = 50.153 — 0.158995. T — 0.0003141113. 7* Milliontedele (millionths), 
hvor T er Temperaturen (7, = 50.153). 
Regnault har fundet Sammentrykkelighedscoefficienten 
for Havvand af en Temperatur af 1795 og en specifisk 
Vægt af 1.0264 at være 43.6- Milliontedele (Moussons Fysik. 
I. S. 258). Antages den samme Lov at være gjeldende 
for Havvand som for rent Vand med Hensyn til Tempera- 
turens Indflydelse paa Sammentrykkeligheden, saa bliver 
ved 0° Havvandets Coefficient 
No = 43.6 + 2.7825 + 0.0962 = 
J. Y. Buchanan har fundet, at Havvandets Coeffi- 
cient er 92.3 Procent af det rene Vands!. Regnet med 
ovenstaaende Verdier findes saaledes for 0°: 1’, = 50.153 X 
IDAR = 16208 XX 1075 
er 46.385, og jeg setter saaledes for Havvand ved T°? og 
Middel af disse to Bestemmelser 
en Atmosfæres Tryk 
7’ = 46.385 — 0.1590. T — 0.000314. T? 
Efter foreløbig Beregning fandtes den til & svarende 
Værdi for rent Vand € = 0.006107 Milliontedele. Jeg setter 
/ ! 
JE é € ; 
derfor - =— =0.0001218 og — — =0.00008118. Den nøj- 
No F å 
LJ ?) 
WI 
: + UR OR Oe fue. ve 
agtige Værdi af — — bliver, som nedenfor vil sees, 0.00008384. 
meee 
oO No 
Det gjør ingen Forskjel i Værdierne for p, om man regner 
Lå 
med den ene eller den anden af disse Værdier for = 
i 
Til Beregningen af 7 anvender jeg Middeltallet af 
Havtemperaturerne i Stykker paa 100 Favnes Dybde fra 
Overfladen til Bunden. Disse ere givne af Temperatur- 
rækkerne eller Temperaturtversnittene gjennem vedkommende 
Station. Middeltallet kaldes 7 og Nævneren i Formelen 
for p bliver 
1 Professor Tait har fundet (Proceedings of the Royal Society 
Edinburgh f. 1883, S. 224) 92.5 Procent, og senere (L. c. f. 1884. 
Side 758) 92.4 Procent. 
in which T is the temperature (7, = 50.153). 
| Regnault found the coefficient of compression for 
| sea-water with a temperature 1795 and-a specific gravity 
| 1.0264 to be 43.6 millionths (Moussons Physik, I, p. 253). 
| Now, assuming the same law to apply for sea-water as 
for pure water with regard to the influence of temperature on 
compressibility, the coefficient for sea-water at 09 will be 
46.4787 Milliontedele (rmillionths). 
J. Y. Buchmann found the coefficient of sea-water to 
Com- 
puting with the above-given values, we find accordingly for 
Ms Fo S SO5g  ©.023 = 26201 X 1033 Ve menn oi 
these two determinations is 46.385, and therefore I take 
be 92.3 per cent compared to that of pure water. ! 
| for sea-water at 7’° and a pressure of one atmosphere 
1 = 46.385 — 0.1590. T — 0.000314. 7” 
| A preliminary computation gave as the value for pure 
water corresponding to &, €= 0.006107 millionths. Hence 
/ / 
Ege 2 å 
I take = =*=0.0001218, and = == (0:000081 184 The 
) in Bm 
i i 
5,2 & : E 
true value of — — will, as shown farther on, be 0.00008384. 
3 No 
It makes no difference in the values for p whether we 
! 
: Meee 
compute with the one or the other of these values for — 
? 
i 
For computing 7/ I make use of the mean of the tem- 
peratures of the sea for intervals of 100 fathoms, from the 
These temperatures are given by 
the serial temperatures, or by the temperåture-sections 
passing: through the Station. The mean I call T, and the 
numerator in the formula for p becomes 
| surface te the bottom. 
1 Professor Tait has found (Proceedings of the Royal Society 
Edinburgh i883, p. 224) 92.5 per cent, and later (ibid. for 1884. p. 
758) 92.4 per cent. 
