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.
Siile
Middelværdien af E under Forsøget er saaledes
7.60239, istedetfor den oprindelige Værdi 7.62793 eller
dE = —0.02554 og vi faa
Hence, the mean value of E during the experiment to on
was 7.60239, in place of the initial value, 7.62793, or dE =
0.02554, and this gives
= = =-0.0104/
df=f. = -/. = -0.0104 /.
J ^ 7.60—5.15 J 2.45 J
Correctionen bliver 1.04 Procent af
Fordunstningsmæng-den i Tidsenheden, og, da den hele Fordunstningsmængde,
cæteris paribus, er proportional med denne, faa vi i vort
Exempel en Correction af — 60 X 0.0104 = — 0.624
cbcm. Den hele Correction naar saaledes ikke op til en
Kubikcentimeter, Grænsen for Nøjagtigheden tilsøs. I
Strøg, hvor Fordunstningen er raskere, bør
Fordunstnings-skaalen være rummeligere eller hellere Maalingerne gjøres
hyppigere.
I 1877 stode begge Fordunstningsm;ialere ved Siden
af hverandre. Deres Resultater kunde saaledes
sammenlignes. Observationerne gjordes i Regelen Kl. 9 Fonn. og
Kl. 9 Aften. Resultatet af de anstillede Sammenligninger
var følgende:
The correction is 1.04 per cent of the water
evaporated in the given unit of time, and. since the total
amount evaporated, cæteris paribus, is proportionate to the
latter, we have in the example a correction of 60x0.0104
zr — 0.624 cbcm. The whole correction, therefore, does not
amount to one cubic centimetre —, the limit attainable at
sea. In localities where the evaporation is more rapid,
the evaporating dish should have greater capacity, or the
measurements be made at shorter intervals.
In 1877. the two atmom eters were mounted side by
side. The results of the observations could thus be
compared. The observations were generally taken at 9 a.m.
and at 9 p.m. The result of the comparisons was as
follows: —
1877. Dag Time. Tidsrum. Fordunstnings- Forskjel.
højde.
Height of Water
Day. ’ Hour. Interval. Evaporated. Difference.
A U A—B
Juni (June) 12 9.’5 a.m.— 9.’ ’o p.m. 11.’5 3.12" - 2.98— 0.14""1
— — 12 13 9. 25 p.m.— 8. 75 a.m. ■I- 5 I-3I 1-54 —0-23
— — 13—14 8. 0 p.m.— 9. 5 a.m. ■3- 5 1.44 1.86 —0.42
— — 14 10. 2 a.111.— 8. 5 p.m. 10. 3 3-09 2 29 0.80
— — 14—15 8. 75 p.m.— 8. 75 a.m. 12. 0 0.62 0.54 0.08
— — 15 9. 0 a.m,— 8. 75 P» 75 1.20 1.01 0.19
— — 16-17 g. 7 a.m.— 9. 4 p.m. 75 0.09 O.OI o-o8
— — 19—20 8. 75 p.m.—10. 0 a.m. 13* 25 5-55 6.01 —0.46
— — 22 ■ i. 3 a.m.— 9. 6 p m. 10. 3 3.02 2.69 0.33
— — 22—23 9. 6 p.m. — 9. 5 a.m. II. 9 2-37 1-25 1.12
— — 23—24 9. 5 a.m.— 5. 5 p.m. 32. 0 3-15 3.69 —0.54
— — 28 9. 5 a.m. -10. 0 p.m. 12. 5 2.38 2-77 —0.39
Juli (July) 9 11. 5 a.m — 7. 5 p.m. 8. 0 0.97 0.97 0.00
Sum: Dagtimer (Day Hours) . . 75-*8 ■ 3-87" ™ 12.72*™* 1.15""
r Nattetimer (Night Hours) 62. 2 11.29 II.17 0.12
» Dag og Nat (Day and Night) 32. 0 3-15 3-6? —0.52
Ialt (Total) 70/00 2 8.31- 27.56"" + 0-75"*
I det Hele taget give saaledes begge
Fordunstnings-maalere meget nær samme Resultat. Summen af Tallene
i den sidste Rubrik, uden Hensyn til Fortegn, er 4.76.
On the whole, both atmometers give accordingly very
nearly the same result. The sum of the figures in the
first column, without regard to sign, is 4.76, from which
<< prev. page << föreg. sida << >> nästa sida >> next page >>
