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falder nu vistnok ikke i ethvert Tilfælde paa samme Tid
eller rettere samme Dybde, men Kurverne antyder, saaledes
som ogsaa de grafisk opsatte Kurver for tie enkelte Lodninger
viser, at der er en vis Regelmæssighed i Ujevnhederne,
saaledes at disse falder nogenlunde omkring samme Dybdetal
ved de forskjellige Tilfælder.
Den Tid, som behøves til at tage et LodsJcud er
væsentlig afhængig af Lodskuddets Dybde. Efter
Skibsjournalen, i hvilken - anførtes Klokkeslettene for Lodningens
Begyndelse, naar Fartøjet stoppede, og for dens Afslutning,
naar der atter sattes i Gang igjen, eller naar en anden
Operation, som Temperaturrække eller Skrabning, begyndte,
findes ved en statistisk Beregning, at i Gjennemsnit krævede
et Lodskud paa
. 100 Favne 20 Minutter:
500 — 40
1000 — 1 Time.
1500 — 1 Time 30 Minutter.
2000 — henimod 2 Timer,
eller i Almindelighed
Tiden for et Lodskud = 20- +• 5- X (Dybden 1 ~ 100)-
100
Denne Tid forbruges omtrent saaledes som følgende Skema
viser.
on by .the unintermitting exertion, are again apparent, to
be again counteracted for a still shorter interval, and so
on de novo, to the end of the operation. True, these
•periodical deviations in velocity do not occur in every
case precisely at the same time, or rather at the same
depth, but the curves here given, as also those
diagram-matically constructed for each individual sounding, indicate
a certain regularity in the* inequalities, and a tendency to
occur at about the same depth in all cases.
The Time required for Sounding depends mainly on
the depth. From data in the ship’s log-book, comprising
the time at which each sounding commenced. — viz. when
the vessel was stopped, —1 and that of its termination,
when she again went ahead. — or the time at which some
other operation, such as dredging or taking a serial
temperature, was begun, we found, by direct computation,
the time each sounding occupied to average as follows: —
100 Fathoms 20 Minutes.
500 — 40 —
1000 — 1 Hour.
1500 — 1 Hour 30 Minutes.
2000 — Nearly 2 Hours.
Hence a sounding occupied 20 m 5 m X (the depth, in
fathoms —lOO): 1-00; and this interval passed very nearly
as set forth in the following tabular statement.
Itvbde i Favne..... 100 500 1000 1500 2000
Vægt af Lod i Pund . 112 112 285 350 365
Stopning af Fartøjet, Forbered, til Lodning 10" 10» Minutter. 10" 10" 10"
Udfiring til 300 Favne a 3 Minutter pr. 100 Favne........ 0 0 y 9 9
Paasætning af Stopper. Linen taget fra
Ind-liivningsmaskinen til Rullen........ 0 0 3 3 3
Udløbstid til Bunds efter Fig. 15........ 1 7 9 17 25
Thermometrenes
Accomodation, Lodlinens Skiftning fra Rul til Spil.......... 8 5 5 5 5
Indhivning ä 3 Min. pi’. 100 Favne...... 3 15 30 45 60
Ialt 22 37 66 89 112
Ovénst. Formel giver . 20 40 65 90 115
Forskjel + 2 —3 + 1 — 1 —3
Depth in Fathoms. . . . 100 500 looo 1500 2000
Sinking-weight iu pounds 112 112 285 350 365
Stopping vessel and
preparing for sounding 10" 10" Minutes. 10» 10» 10"
Veering 300 fathoms of Line, at 3 min. pr. 100 fathoms..... 0 0 9 9 9
Putting on stoppers and shifting Line from drum of donkey-engine to the reel...... 0 0 3 3 3
Time required for
reaching bottom,
according to Fig. 15 ... . 1 _ 9 17 25
Time for Accomodation of the Thermometers, ami for shifting Line from the reel to drum of donkey-engine . . . 8 5 5 5 5
Heaving in at 3m. pr. 100 fathoms..... 3 15 30 45 60
Total 22 37 66 89 112
The above formula gives 20 40 65 90 115
Difference +2 —3 + 1 — 1 —3
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