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.
152
1,1,\ ld, A
i’ J;’ u>
Aim. mm. 111111. mm.
Max. 01.16 ..02706 1-51 »•37
Mil». 01.00 1.02716 O.05 3.38
Max. 1S2.78 1.02831 6.39
Min. 182.61 1,02732 2.14 0.20 6.40
Max. 247.7 2 1.02800 * 6 0 - 8.6ft
Min. 24703 1.02741 1. 4 8.70
Heraf ser man. at do specifiskc Vægter give Trykkene
i Dybet med en Nøjagtighed af 2 til il Millimeter
Kviksølvtryk. Usikkerheden i Tyngdefactoren Ii medfarer ingen
Usikkerhed i Trykkene, der gaar op til en halv Millimeter.
En sandsynlig Tilstedeværelse af en Fejl i Coefficient«! for
Sovandots Sammentrykkelighed medfører en Fejl i Trykkene,
der er l’et merkelig. Men denne Fejl er saagodtsom
constant over hele Havet i et og samme Niveau, saa
afTryk-forskjellerne i Niveaufladerne lilive ganske uafliiengige
deraf. Dette sidste gjælder i end højere Grad Oocftiriontcii h.
Fejlene i de heregnede Tryk-Forskjeller i Dybets
NiveauHader blive saaledes praktisk talt kun afhængige af
Fejlene i ,1c beregnede Værdier al i. Forskjellen mellom
Trykkene i tø Punkter vil faa en sandsynlig Fej! af
V 2 jlJ’J di’, da Fejlene i hvert Punkt er ± il
Disse sandsynlige Fejl blive altsaa:
From this Table, we perceive that the specific
gravities give the pressure in the deep with a precision of
from 2 to 3 millimetres mercury-pressure. The error in
the gravity-factor h does not involve any error in the
pressure, which amounts to half a millimetre. The
probable presence of an error iu the coefficient of
compression for sea-water, involves ail error iu the pressure quito
appreciable. But this error is well-nigh constant
throughout the whole extent of ocean at one and the same level,
so that the differences of pressure at the surfaces of level
is wholly unaffected thereby. This refers still more forcibly
to the coefficient fl.
The errors in the computed differences of pressure at
the surfaces of level of the deep, depend thus,
practically speaking, only on the errors in the computed
values of i". The difference in pressure between two
ldthe error
points will have a probable error ol’ y2
i,i y
at each point
arc therefore: —
being + ’J d 2’. These probable errors
i 51«) Favnes Dyb 1.51 12 = 3.14wm.
i limn - 2.14 v’2 = 3.1)3
i 15lHi - - 2.1)4 v’2 = 3.73
Forat kunne bringe Nøjagtigheden optil I Millimeter
Kviksølvtryk. innatte den specifiskc Vægt bestemmes 4 Gange
nøjagtigere, altsaa være nøjagtig i 5. Decimal, eller
Antallet af Observationer af den specifiskc Vægt være saa
stort, at den sandsynlige Pejl af samme i et enkelt Punkt
i Havets Dyb var 4 Gange mindre end den vi have
opnaaet. Her tales ku......I Dybder, der ikke synderlig
overskride IdOU Favne.
Sammenlignes de sandsynlige Fejl af
Tryk med Størrelsen af Trykkene selv. og
den tilsvarende sandsynlige Fejl af en Barometerhøjde paa
7!>n mill, faar man
at a depth of 5«) fa
at —— 1(11)11 —
at 15(H) _
In
1.51 V2 = 2.14 1
2.14 V 2 = 3.(13
2.1)4 VI = 3.73
order to leach a precision of I millimetre
the specific gravity would have to lie
determined with quadruple precision, accordingly to the 5th
decimal, or the number of observations for specific gravity
lie so great, that the probable error of such at any one
point throughout the depth of the sea he 4 times less than
that we attained. Here the question merely relates to
depths not exceeding 1500 fathoms.
[t’ the probable error of the computed pressure be
compared with the amount ol’ pressure itself, and if the
corresponding probable error of a barometrical height of
76(101111. he likewise calculated, wo shall get: —
for 500 Favne (fot
,. 10(H)
,. 1500 ..
I Standard Hum
1.1): 1.51: lill.13 X 700) = 0.01X102181 = 4s53i,; Bar. o.OI6611
2.14: (183.1)2 X 760) = 0.00001544 = „.-f^ y 0.0117
2.04: (274.5« X 760) = 0.00001263 = „ O.OOilO
0.01: 7611
= 0.0011111318 = jaJi,
11.011H I
Sammenligningen stiller sig saaledes gunstig for
Nøjagtigheden af de beregnede Tryk i Havets Dyb ligeoverfor
Maaling«! af Atmosfærens Tryk.
Vil man tage et fuldere Hensyn li! de forskjellige
The comparison is accordingly favourable to the
precision of computed pressure in the depths of the sea as
contrasted with the measure of atmospheric pressure.
Should we wish to pay greater regard to the various
<< prev. page << föreg. sida << >> nästa sida >> next page >>
