25 



papir. Bundprøverne 0Terlevered.es derpaa 

 Varetæet. 



til Kemikernes 



Loddemes Udløbshastigheder. Effcer de i Loddejourna- 

 len indeholdte Data gives her nogle Resultater af Studier 

 over Loddernes Bevægelse under Lodningen. 



Rørlod. Som tidligere bemærket, var Lodlinens første 

 200 Favne inddelt med Mærker for liver 10 Favne. Paå 

 Station 375 gjordes et Forsøg til Bestemmelse af Linens 

 eller Loddets Udløbshastigheder under de første 200 Fav- 

 nes Udløb.idet Tidsøjeblikkene for hvert 10-Favne Mærkes 

 Gaaen i Våndet noteredes, under det at Bremsningen paa 

 Kullen søgtés holdt saa normal som muligt. Resultatet af 

 dette Forsøa indeholdes i den følgende Tabel. 



1877 and 1878 cylindrical glass jars. about 4 mehes high 

 and wide and covered at the top with strong vellum paper. 

 When ready for storing, the samples of the bottom were 

 lett in charge of the chemist to the Expedition. 



Vélocity of flir head. — In this Section we give some 

 results obtained by investigating the rate of descent from 

 the data registered in the sonnding-journal. 



The Tube-lead. - As previously stated. the line vas 

 graduated for the first 200 ta thorns into lengths of tens ul' 

 fathoms. At Station 875. we sought to determine the ab- 

 solute rate of descent down to a depth of 200 fathoms, by 

 registering the exact moment at vhich each of the ten- 

 fathom slips entered tbe water, striving the while to keep the 

 braking as uniform as possible. The following Table shows 

 the results of the experiment. 



Favne. 



Ticl fra 

 „Lad etaa". 



Interval. 



Hastighed. 



Favne pr. Sek. 



1.67 

 1.67 

 3.33 

 2.50 

 1.67 

 1.43 

 2.i io 

 1.43 

 1.67 

 1.43 

 1.43 

 1.43 

 1.25 

 1.25 

 1.43 

 1.25 

 1.11 

 1.25 

 1.25 

 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 Våndet samtidig med at Bremsningen er 

 lettere at regulere, bevirker en større Modstand mod Be- 

 varelsen. 



Af Iagttagelser af Udløbstiderne for 100 Favnemær- 

 kerne paa en større Række Stationer tindes som gjennem- 

 snitlige Værdier de i den følgende Tabel opførte Tal: 



We see from a glance at the cofuinn headed "Vélo- 

 city in fathoms pr. second," that the rate of descent. which 

 at the moment of letting gc> is nil. tends at first to in- 

 crease. 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-lathom slip that successively entered the water, 

 and represent the average rate of decent. 



Deu norske Nordliavsexpedition. C. Willfc-: Apparaterce og deres Brug. 



