Full resolution (JPEG) - On this page / på denna sida - Sidor ...
<< prev. page << föreg. sida << >> nästa sida >> next page >>
Below is the raw OCR text
from the above scanned image.
Do you see an error? Proofread the page now!
Här nedan syns maskintolkade texten från faksimilbilden ovan.
Ser du något fel? Korrekturläs sidan nu!
This page has never been proofread. / Denna sida har aldrig korrekturlästs.
11
skelighed var Udfiringen over Rækken og ned i Søen, thi
ved Slag mod Skibssiden kunde Jerntraadene løsne og
Lodderne tabes. Man firede den derfor saa hurtig som muligt
ned i Vandet, hvor dens Svingninger under Fartøjets
Bevægelser lettere kunde dæmpes og gjøres uskadelige.
Lodlinerne, der var leverede af Rebslager Timm i
Christiania, var af fineste Sort italiensk Hamp. 2.cm6 (1
Tomme) i Omkreds, voxede og glatstrøgne. De holdt ved
anstillet Prøve en Vægt af 750 Kilogram (1500 Pd.). De
viste sig særdeles gode. og der blev brugt kun en Line
hver Sommer. Linen blev mærket for hvert hundrede
Favne med omviklede og paamerlede Stykker Flagdug af
forskjellig Farve. De første 20 Favne var dobbelt Part
med Kous og Hex til Loddet. I 1876 var Lodlinen
inddelt i norske Favne, og de første 100 Favne havde
Læder-mærker for hver 10 Favne. I 1877 og 1878 var Lodlinen
inddelt i engelske Favne og de første 200 Favne
opmærkede for hver 10de Favn. Opmærkningen foretoges
ombord. idet der med Tommestok blev sat Mærker i Dækket
for en Længde af 5 Favne, hvilke ogsaa senere brugtes,
naar Linen blev eftermaalt og rettet.
Som anført, havde vi ingen Sprængning af Lodlinen
foraarsaget ved at Baillie-Maskinens Lodder ikke gik af
Røret. Som Bevis paa Lodlinens Godhed kan anføres, at
den under Lodningen en Gang, medens den altsaa var i
fuld Fart. gik i Hus i Loddeblokken. idet denne ikke
drejede sig hurtigt nok ind i Planet mellem Linens Parter.
Uagtet det voldsomme Ryk og det snevre Rum. hvori
Linen blev kneben ind i Blokken, over tildels skarpe Kanter,
holdt den uden at lide Skade. Den eneste Sprængning af
Lodline fandt Sted i 1877 paa Turen nordenfor Tromsø,
idet Lodlinen, som under Indhivningeu var kommen under
Fartøjets Bund. blev grebet af Skruen og sprængt. Ved
at fire et Lod i slak Bugt ud fra Stevnen og med Enderne
af Linen langs hver af Fartøjets Sider hale det agterud,
lykkedes det vagthavende Officer, Capt. Grieg, at fiske
Lodlinen, der havde kastet sig om Propelleraxen saa vidt,
at den ikke sank; derved reddedes flere Thermometre og
de af dem registrerede Bund-Temperaturer.
Accumulatoren bestaar af en Samling Kautschuk-Stroppe
(Fig. 9), hver bestaaende af 2 sammenføjede Strenge af
2 cm ± Toms) Tykkelse. I hver Bugt er en Træ-Kous
med Stjert, og Strengene holdes sammen om Trækousene
ved tynde Kautschuk-Ringe. Stroppene ere ordnede
mellem 2 stærke Træskiver. 0m.442 (1 Fod 5 Tom.) i Diameter
og 0m.045 (1.7 Tom.) tykke, med ligesaamange smaa
Huller som der er Stroppe. Stjerten tages gjennem Hullerne
og samles om en svær Kous, saaledes at Stroppene blive
jevnt stive. Fig. 10 viser Lodde-Accumulatoren. Den be-
lay in lowering the instrument.; bumping against the
ship’s side was apt to disengage the sling, and thus
occasion the loss of the sinkers. We therefore got the machine
as quickly as possible into the water, where the swinging
motion given to it by the rolling of the vessel could
produce no injurious result.
The Sounding-lines, supplied by Mr. Timm, ropemaker
of Christiania, were of the best Italian hemp. 1 inch in
circumference, with a breaking strain of 1500 pounds, and
well waxed and smoothened. They proved of excellent
quality, one amply sufficing for a whole cruise. The lines
were graduated into hundreds of fathoms by attached slips
of different coloured buntine. wrapped round the surface.
Each was rove double the first 20 fathoms, and provided
with a thimble and a shackle, by which to make last the
sounding-machine. For the first year’s cruise, in 1876. the
line was graduated into Norwegian fathoms, and had slips
of leather at every 10 fathoms of the first hundred; but
for the two remaining cruises, in 1877 and 1878, we
substituted English measure, graduating the first two hundred
fathoms of the line into tens of fathoms. The line was
graduated on board. 5 fathoms having been previously
measured out along the deck with a foot-rule. These
five-fathom intervals served, too. as a reliable standard when
re-measuring and adjusting the line.
As stated above, the weights were detached at every
sounding with the Baillie machine: and hence we never
had the line carry away from their failing to drop off on
the instrument striking the bottom. Meanwhile, the
excellence of its quality came on one occasion to be
severely tested. When running #out with full velocity, the
line suddenly caught in the sounding-block, which had not
readily adjusted itself to the direction taken by the former
on its rapid passage out. But. though brought up in this
way with a violent jerk, and jammed besides into the block,
partly, too. against sharp edges, the line was strong enough
to stand the strain uninjured. The only sounding-line that
parted was one used in 1877. on our cruise north of Tromsø.
We were hauling in the lead, when it got underneath the
ship’s bottom, fouled the screw, and was broken. By
lowering a weight over the bows in a slack bight, and then,
with the ends of the rope extending one along either side
of the vessel, hauling it aft. the officer of the watch.
Captain Grieg, succeeded in fishing the sounding-line, which
had tvisted round the screw-shaft just sufficient to keep it
from sinking, and thus recovered several thermometers, along
with the temperatures they had registered at the bottom.
The Accumulator is built up of a number of straps
(Fig. 9). each composed of 2 vulcanised india-rubber springs,
three-quarters of an inch thick, joined lengthwise. In
each of the loops is fixed a wooden thimble, with a
lanyard. and the springs’ are kept together by means of thin
india-rubber rings. The straps are kept free from one
another and equably taut, by stretching them between a
couple of strong wooden disks. 1 foot 5*/2 inches in
diameter and l3, i inch thick, bored with a hole for every strap,
the lanyards being rove through the holes and brought
<< prev. page << föreg. sida << >> nästa sida >> next page >>
