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papir. Bundprøverne overleveredes derpaa til Kemikernes
Varetægt.
Loddernes Udløbshastigheder. Efter de i
Loddejourna-len indeholdte Data gives her nogle Resultater af Studier
over Loddernes Bevægelse under Lodningen.
Rørlod. Som tidligere bemærket, var Lodlinens første
20ü Favne inddelt med Mærker for hver 10 Favne. Paa
Station 375 gjordes et Forsøg til Bestemmelse af Linens
eller Loddets Udløbshastigheder under de første 2(10
Favnes Udløb.-idet Tidsøjeblikkene for hvert 1 O-Favne Mærkes
Gaaen i Vandet noteredes, under det at Bremsningen paa
Rullen søgtes holdt saa normal som muligt. Resultatet af
dette Forsøg indeholdes i den følgende Tabel.
1877 and 1878 cylindrical glass jars, about 4 inches high
and wide and covered at the top with strong vellum paper.
When ready for storing, the samples of the bottom were
left in charge of the chemist to the Expedition.
Velocity of the Lead. — In this Section we give some
results obtained by investigating the rate of descent from
the data registered in the sounding-journal.
The Tube-lead. — As previously stated, the line was
graduated for the first 200 fathoms into lengths of tens of
fathoms. At Station 375. we sought to determine the
absolute rate of descent down to a depth of 200 fathoms, by
registering the exact moment at which each of the
ten-fathom slips entered the water, striving the while to keep the
braking as uniform as possible. The following Table shows
the results of the experiment.
Favne. Tid fra ..Lad gaa". Interval. Hastighed. Favne pr. Sek. Fathoms. Time. . Interval. Velocity. , Fatli. pr. See.
0 0.m 0s
10 6 6* 1.67
20 12 6 1.67
30 15 3 3.33 #
40 19 4 , 2.50 ’
50 25 6 1.67
60 32 7 1.43
70 37 5 2.00
80 44 7 1.43
90 50 6 1.67
100 . 57 7 1.43
110 1 4 7 1.43
120 1 11 7 1.43
130 1 19 -8 1.25
140 1 27 8 . 1.25
150 1 34 7 1.43
160 1 42 8 1.25
170 1 51 9 1.11
180 1 59 8 1.25
190 2 7 8 1.25
200 2 16 * 9 1.11
Man-ser af Rubrikken ..Hastighed i Favne pr. Sek.",
at Hastigheden, hvormed Loddet synker, der er lig Nul i
det Øjeblik, man „lader gaa", i Begyndelsen er voxende,
men naar sit Maximum allerede ved 25 Favnes Dyb, og
derpaa er den gjennemsnitlig aftagende med Dybden, idet
Linens Friktion i Vandet samtidig med at Bremsningen er
lettere at regulere, bevirker en større Modstand mod
Bevægelsen.
Af Iagttagelser af Udløbstiderne for 100
Favnemærkerne paa en større Række Stationer findes som
gjennemsnitlige Værdier de i den følgende Tabel opførte Tal:
0 0.CT 0S
10 6 6S 1.67
20 12 6 1.67
30 15 3 3.33
40 19 4 2.50
50 25 6 1.67
60 32 7 1.43
70 37 5 2.00
80 44 7 1.43
90 ^ 50 6 1.67
100 57 7 1.43
110 14 7 1.43
120 1 11 7 1.43
130 • 1 19 -8 1.25
140 1 27 8 1.25
150 1 34 7 1.43
160 1 42 8 1.25
170 1 51 9 1.11
180 1 59 8 1.25
190 2 7 8 1.25
200 2 16 9. LU
We see from a glance at the column headed
"Velocity in fathoms pr. second." that the rate of descent, which
at the moment of letting go is nil. tends at first to
increase, soon however reaching its maximum, at a depth of
25 fathoms, after which it begins, and as a rule continues,
to decrease with the depth, the augmenting friction in the
water, along with increased facility of braking, together
occasioning greater resistance to the downward motion of
lead and line.
The figures in the following Table are deduced from
the intervals, timed at a number of Stations, for every
hundred-fathom slip that successively entered the water,
and represent the average rate of decent.
Deu norske Nordliavsexpedition. C. Wille: Apparaterne og deres Brug. 4
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