29 



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 de enkelte Lodninger 

 riser, at der er en vis Regelmæssighed i Ujevnhederne, saa- 

 ledes at disse falder nogenlunde omkring samme Dybdetal 

 ved de forskjellige Tilfælder. 



Den Tiil. sum behøves til at tåge et LodsJcud er væ- 

 sentlig afhængig af Lodskuddets Dybde. Etter Skibsjour- 

 naleri, i hvilken- anførtes Klokkeslettene for Lodningens 

 Begyndelse, naar Fartøjet stoppede, og for dens Afslutning, 

 naar der atter sattes i Gang igjen, (dier naar en anden 

 Operation, som Temperaturrække eller Skrabaing, begyndte, 

 tindes ved en statistisk Beregning, at i Gjennemsnit krævede 

 et Lodskud paa 



20 Minutter; 



40 



1 Time. 



1 Time 30 Minutter. 



henimod 2 Timer. 



100 Favne 



5 1 fl ) — 

 1(1(1(1 — 



1500 



2000 — 

 tdler i Almindelighed 

 Tiden for et Lodskud — 20 m +5" 



x (Dybden i Fv. — 100 ), 

 Kiil 



Denne Tid fprbruges omtrent saaledes som følgende Skema 



viser. 



Dybde i Favne 100 500 1000 1500 2000 



Vægt af Lod i Pund . 112 112 285 350 365 



Stopning af Fartøjet, 

 Forbered, til Lodning 



Udfiring til 300 Favne 

 å 3 Minutter pr. 100 

 Favne . . 



Paasætning af Stopper. 

 Linen tåget fra Ind- 

 hivningsmaskinen til 

 Rullen 



I rdløbstid til Bunds efter 

 Fig. 15 



Tbermometrenes Acco- 

 modation, Lodlinens 

 Skiftning fra Bul til 



10' 



10" 



Minutter. 

 10"' 



lu» 



10" 



17 



25 



on hv .the unintermitting exértion. are again apparent, to 

 be again counteracted for a still slunter interval, and so 

 mi de novo, to the end of the operation. True, tbese 

 •periodical deviations in velocitj do not occur in every 

 case precisely at the same time, or rather at the same 

 depth, hut the curves here given, as also those diagram- 

 maticall) 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. 



Thr 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, — and that of its termination, 

 when she again went ahead, — or the time at which senne 

 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: 



Hence a sounding occupied 20 '" -4- 5 '" X (the depth. in 

 fathoms — 100): K)0; and this interval passed very nearly 

 as set forth in the following tabular statement. 



Depth in Fathoms. . . . 

 Sinking-weight in pounds 



Stopping vessel and pre- 

 paring for sounding 



Veering 300 fathoms of 

 Line. at 3 min. pr. 

 100 fathoms ..... 



Putting on stoppers and 

 shifting Line from drum 

 of donkey-engine to the 

 reel . . . : 



Time required for rea- 

 ching bottom, accord- 

 ing to Fig. 15 . . . . 



Time for Accomodation 

 of the Thermometers, 

 and for shifting Line 

 fn nu the reel to drum 

 of donkey-engine . . . 



Heaving in at 3m. pr. 



100 

 112 



5l il I 

 112 



1000 



285 



1500 

 350 



2i " KJ 

 365 



10' 



10" 



Minutes. 



10" 



10" 



10' 



17 



•>o 



