26 
aW = + V (a dw)? I (b dv)? I (c dy)? 
(18) 
du= + V (aw dw)? + (b' dv)? + (dy)? 
For at finde den gjennemsnitlige Verdi af dW og 
du har jeg gaaet frem paa folgende Maade: 
Ifølge den meteorologiske Dagbog var i 1876 Mid- 
delværdien af W = 9."85 pr. Secund og af v = 1.792 pr. 
Secund. Heri ere indbefattede alle de Tilfælder, i hvilke W 
eller v vare lig 0. Af 744 Tilfælder vare 308 med v = 0. 
I 1877 var Middelværdien af W = 6.9, af v = 1.95 
It SUS 9 5 MERE. 
I Middel af begge WY = MU 0 = 135 
I 1877 var v = 0 i 352 Tilfælder af 965 
Lisi - o= 0 i BA å HILST 
Sættes med runde Tal 
for 1876: W = 10 ør See, 9 = VP joe DEG 
oe SI? og Ise NN = 64% jor, See, oO = % på See, 
saa giver Beregningen efter (18) og (19) folgende Resultat. 
| 
| 
| 
(19) 
To find the average value of dW and du, I have 
proceeded as follows: — 
According to the entries in the Meteorological Journal 
for 1876, the mean value of W = 9.”85 per second, and that 
of v=1."92 per second. These values include all cases in 
which W or v was equal to 0. Of 744 observations, v 
was equal to 0 in 308.. 
In 1877 the mean value of W= 6.9 ; of v 1.95 
Ibn ASUS , 9 >» » W=80 3 , w 183 
The mean of both was accordingly W= 7.45; of v 1.885 
In 1877 v was equal to 0 in 352 cases of 965 
lia 1808 5  ¢ Be SO 
Putting, in round numbers, 
for 1876, WY = OP irae seconls @ = 2 joer 
second, 
for 1877 and 1878, WY = 12%) jose sxeonels’ © = BP par 
second, the computation, according to (18) and (19) gives 
the following result: — 
1876. 1877 og (and) 1878. 
W = 1, 0 S 2, dø =5 ET dd = 07, dy = GP. = GER O = 2°, dd = 07, GO S O82, dy) = 9, 
hina | | | | 
w= 0° |m = 309 | w ='609 |" 909 la 120°) = 1509 14 == 180° | aw == 0° | = 309) w = 609) 14 = 90% 1 = 19094 == 1509%|14 = 180° 
| | | 
] | | | 
VW ZS | LBQHO | 1198 | 1185 | 1002 | OLD || C233 8.”0 WD = 65% 1 073 1 808 1 708 | 6078 | Bog | 80 
| | 
| | | | | 
= ) 0 0 0 | 0 0 0 0 0 | 0 0 0 | aa | 0 
yYy o' 25 51 TO | BOG? | 249 180 y O 24 49 | 75 105° | 140 180 
o=| © | 8 9? rd | nat FÅ) | 0? o=| & 6° ni | ag 150 no? || o 
| | | 
adw = | 1.00 | 1.00 | 0.99 | 0.98 | 0.98 | 0.99 | 1.00 adw = | 0.50 | 0.50 | 0.49 | 0.48 | 0.48 | 0:49 | 0.50 
| | | | 
| | 
bdv OKO | OAS | O25 | OG | O295 | ©43 | 50 bdv = | 0.20 | 0.17 | 0.10 | 0.00 | 0.10 || 0.17 | 0.20 
| 
Ch) = || CO || O00) | OG | OG | 0.15 | 0.09 | 0.00 cdy = | 0.00 | 0.09 | 0:15 | 0.17 | 0:15 | 0.09 | 0.00 
= - _| dd = | 
| | | | | 
WY S|) hora | LOG) | FØR | LOO | 1.02 | FOS | Tue WW = | ©.84 | ©.3 | O52 | 0:51 | 0:51 | 0.53 | 0:54 
| | | 
GOD =| mo | OS | OO | ala in | OY? 0.°0 HOD | OL | O81 | O88 | 120 | TA OM KO 0.%0 
| 
vm =| 8% | 204 | 308 | 209 DE | TR ONO WHO = ob | 008 | 103 | 208 | 203 | OG 0.00 
/ | ! | 
an =) OMD | SO | 305 | 500 | 4.95 | 4:01 4:00 Fan = | 6003 | ©£2 | 307 | Bo | 403 BF 307 
| | i 
Ger a | | | 
| | 
dm =| G2o| 625 | GPa | So | 503 | AA | Ag) dm = | 3 | O82 | 300 | 503 | 46 | 3% 307 
| | 
Af disse Tabeller ser man, at Veerdierne af de sand- 
synlige Fejl af de beregnede Vindhastigheder og Vindret- - 
ninger praktisk talt ikke ere væsentlig forskjellige fra 
Værdierne af de sandsynlige Fejl af de ombord observerede 
From these Tables, itappearsthat, practically, the values 
of the probable error of the computed velocity and the computed 
_ direction of the wind, are nearly the same as the values of the 
probable error of the velocity and direction as observed on 
