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23
fast paa Rullen agterud, hvor 2 Mænd stode færdige til
at bremse. Derpaa kommanderedes „Lad gaa"! og
Lodningen udfortes som ovenfor for Ror-Loddet beskrevet.
Udfiringen af ßaillie-Maskinen til 2UO eller 300
Favnes Dyb. før man lader gaa. er nødvendig paa Grund af
den store Vægt. Lodliuen har at bære. og som vilde gjøre
det umuligt med de havende Bremsemidler at kunne
regulere Linens Bevægelse. De 200 til 300 Favne Lodline,
der ved Operationens Begyndelse allerede er i Vandet, giver
saamegen Friktion, at det er Bremserne muligt, om end
med Anstrængelse, at holde Rullens og Linens Bevægelse
under Kontrol.
Ved Lodning paa større Dyb er det ikke saa let at
iagttage det Øjeblik, da Loddet naar Bund. som ved
mindre Dybder. Linen lægger sig ikke ned i Dækket, men
vedbliver at løbe fra Rullen, efterat Loddet er i Bund. med
en Hastighed, der ofte kun er lidet mindre end under
Loddets Synken. Ved med udelt Opmærksomhed at følge
Linens Fart, navnlig dens Bevægelse gjennem
Loddeblok-ken under Accumulatoren, har man imidlertid et næsten
altid sikkert Middel til at observere Øjeblikket, naar
Loddet slaar i Bund: man ser da nemlig Blokskivens
Rotationshastighed pludselig formindsket. En første Kontrol har
man strax deri, at Slakken af Lodlinen nu kan hales ind
med Haandmagt. medens det, saalænge Loddet løber, i
Regelen vil vise sig ugjørligt ved Haandmagt at standse
Bevægelsen. Den sædvanlige Kontrol med Notering af •
Klokkeslet for hvert Hundredefavnsmærke, som gaar i
Vandet, anvendtes jevnlig. Den sidste Kontrol havdes
endelig deri. at Accumulatoren i det Øjeblik. Lodrøret (og
Vandhenteren) loftedes af Bunden, tydelig strakte sig ud.
Fra (lette Øjeblik begyndte man, som ovenfor beskrevet, at
maale Favnetallet over sidst udløbne Mærke. Naar
Øjeblikket, da Loddet slog i Bund. var utvivlsomt at iagttage
paa den udløbende Line, viste Methoden med
Tidsintervaller for hver 100 udløbne Favne sig ulige paalideligere ved
Baillie-Maskinen end ved Rørloddet.
Exempel.
No. 354. .
Klokkeslet. . 4A 40"’ p. m.
Vind.....N.
Styrke .... 3
Vejr.....Skyet
Sø......3
Vægt.....315 Pd.
of line with the donkey-engine. The engine was now
stopped, the fore part of the line secured with a stopper to an
eye-bolt on the deck of the roundhouse, and the after part
removed from the drums and tightly wound on the reel
aft. where a couple of men stood ready to commence
braking. The word being now given to let go, the operation
was carried out in the manner described above for sounding
.with the tube-lead.
Veering the apparatus 200 or 300 fathoms
preparatory to letting go. was indispensible with the Baillie
machine, owing to the great strain upon the sounding-line,
the motion of which would otherwise have been impossible
to regulate with the means of braking at our disposal.
The friction of the 200 or 300 fathoms of line in the
water at the beginning of the operation, enable the
brakesmen. though with some little exertion, to command the
revolutions of the reel and the motion of the line.
When sounding in greater depths, it is by no means
so easy as in water comparatively shallow to tell the exact
moment at which the lead touches the bottom. The line
will not drop flat on the deck, but go on running off the reel,
even after the lead has reached the bottom, and with a
velocity but very little inferior to that it had during the
descent of the lead. Meanwhile, by closely noting the
speed of the line, in particular where it passes through
the sounding-block below the accumulator, we have, in the
great majority of cases, a sure means of accurately
determining the moment when the lead strikes the bottom, the
rotation of the sheaf of the block becoming instantly slower.
Moreover, the slack part of the line’ can then be readily
brought in by hand, whereas so long as the lead is sinking,
it will, as a rule, be found impossible to check its motion
by physical strength alone. The usual mode of
measurement, by noting down the exact time at which each of the
300 fathom slips entered the water, was frequently adopted.
As a final resort, we had the test afforded by the visible
extension of the accumulator the instant the sounding-tube
and the water-bottle were lifted from the bottom. We
then, as stated above, immediately began to measure off
the number of fathoms run out after the låst slip had
entered the water. Provided the arrest of the weight at the
bottom could be accurately determined by observing the
velocity of the line, the method of measuring by
time-intervals. for every 100 fathoms run out, was found to be far
more trustworthy with the Baillie machine than with the
tube-lead.
Extract from the Sounding-journal.
No. 354.
Time...... 4 40 p. m.
Wind......N.
Force......3
Weather .... Cloudy
Sea.......3
Weight . . .315 pounds
Date 1878 August lltli.
Lat......78° 1’ N.
Long.....6° 54’ E.
Temp, of Air 3°. 0.
Do. of Sea 4°. 5.
Depth. ... 1343 Fath.
Bottom . . . Biloculina Clay.
Character. . Very good.
Dato 1878 August 11.
Bredde... ... 78° 1’ N.
Længele . . 6° 54’ E. Greew.
Lufttemperatur 3°.0
Overflade do. 4".5
Dybde..... 1343 e. F v.
Bund .... Biloçulin - Ler
Karakter . . . Meget godt.
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