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r^^/O.ooosto the obs. numbers of sp. weight, which are higher than I.0235
bo 2 lo.OOOS > » » T> » » * from 1.0235 to I.0200
03 (T3 <
0 O \0.0004 * » * » » » » > 1.0200 » 1.0180
0 r* \0.0003 » > » > * » » » 1.0180 » 1.0150
.—
•-1 I”1 °’|0.0003 » > » » » » » » 1.0150 » 1.0140
b o ^ I
o ^ 10.0002 s*» ’ * * > - 1.0140 » 1.0104
“S*B 10. 1 ’ * » 1.0104 » 1.0000
The greatest discrepancy between the corrections (=0.oooia)
is at 1.0240 and I think the computed spec, weights can be
considered to be true within O.0002. This ambiguity causes
an uncertainty of O.02 p. C. in the calculated amount of salt.
These corrections, however, are strictly applicable only in
case the original observation was made within those limits of
temperature, where the correction from the temperature of the
water-sample in situ to C is less than O.0001 and
consequently can be omitted. The observations taken on board
the Vega generally fulfill this condition, with the exception of
the determinations in the winter months, which were executed
in the cabin at a temperature of about + 10° or +11° C. I
have recorded these observations without any corrections at
all. Happily the titrations of chlorine executed on board the
Vega are sufficient to give one an idea of the saltness of these
water-samples.
From the reduced spec, weights at ^7^0 C the percentage
of salt in the water-samples is computed by means of the
coefficient 123.8. I deduced this number from the analyses of
the following 4 water-samples.
Date 1878. Depth meters. Temp. in situ. Spec. gravity observed. Spec, gravity reduced ——- C. 1 +4 Cl titration. > 3 0 Coefficient Amount of salt. Salt analysis. 1 Spec, gravity — i.j Coefficient Amount of salt.
Aug. 20 128 — i°-3 I.O274 I.0279 I.920 % .803 3-463 % 24.1
Sept. 7 22 — I°.2 I.O242 I.0247 I.691 % ■799 3.044 / 123.2
Aug. 25 11 + 2°.6 I-OI5I I.OI54 I.064 °0 1.796 1.911 % 24.1
Aug. 31 7 + l°-7 I.OI IO I.OI 12 0.763 0/ 7° I.814 I.384 % 23.6
mean = .803 mean = 23.S
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