Naar nu Instrumentet registrerer n Dele i 30 Secunder, eller 
n 
1 I Secund, bliver den foreløbig beregnede Vindhastig- 
30 
hed of = 392? = NST 7, 
Vi faa saaledes 
Sand Vindhastighed => NØS 46 OOO 72. 
Foreløbig Vindhastighed —— 0.96667 n. 
Correction d —= => ills — OHA ms 
Å py 
ættes her n 0.96667 faaes 
EVER OSS 
® = ols — gonger © 
v = 1.018 + 0.8431 v 
0.15167 
ov — å = 1.51 == a ra 4 
LEDE pet DUS = gass © 
9 == V= HiB — O0,1509 3 
Herefter beregnes følgende Correctionstabel. 
v v Corr. 
| fra (from) o 
On 
\fra (from) o | 
o I til @o)+1.5 | til (to) 1.5 
I DA + 1.4 
2 RB + 1.2 
3 4.0 + 1.0 
4 4.9 ++ 0.9 
5 5:7 ar Oxf) 
6 6.6 + 0.6 
7 7-4 + 0.4 
8 8.3 + 0.3 
9 Q.1 + 0.1 
IO 9.9 — o. 1 
I I 10.8 = O2 
12 11.6 — 0.4 
Man ser, at Fejlen ikke overstiger 1” pr. Secund 
melon å = PP oe I = IO® as cen oe ©, mer v7 = 
1.518 
0.1569 = GT 
Da det anvendte Instrument og de anvendte Obser- 
vationsmethoder, i Forbindelse med Vindhastighedens egen 
variable Størrelse selv i kortere Tidsrum end 30 Secunder, 
neppe tør antages at kunne maale Vindhastigheden nøjere 
end med omkring 1 Meters Nøjagtighed pr. Sec., da frem- 
deles den midlere Vindhastighed, der er maalt i 1876, er 
mellem 9” og 10”. og de maalte Hastigheder sjelden ere 
mindre end 3” og større end 16”, og da desuden hertil 
kommer, at den Nøjagtighed, hvormed Skibets Fart i Ob- 
servationsøjeblikket kunde bestemmes i 1876, oftere neppe 
var større end at Fejlen kunde dreje sig om I til 2 Kvart- 
30 x 2ar, or 29.70. If the instrument registers n divi- 
: AG GOD SE 
sions in 30 seconds, or 30 division in one second, the com- 
n 
== 29) = 
30 
puted approximate velocity of the wind v will = 
0.96667 m. 
Hence, we have — 
True Velocity of Wind 
Approximate Velocity of Wind v’= 
vy = 1.518 + 0.81500 n. 
0.96667 m. 
Correction DQ HE Lil) SD 03 40, 
| v 
Now, putting n = 096667; Ve get 
ae OSL _, 
v= 1.518 + 0.96G67 2 
gd = HI I OSA 3 
Å å 0,15167 ,, 
and v — v = 1.518 — 0:96667 * 
åg == 1519 — Ola) å 
From this formula the following Table of Corrections 
has been computed. 
DÅ v Corr. 
13 1205 | — 0.5 
14 13.3 — 0.7 
15 14.2 — 0.8 
16 15.0 == 1.0 
17 15.8 == fl 
18 16.7 — 1.3 
IQ 17.5 — tow) 
20 18.4 — 1.6 
21 10.2 — 1.8 
22 20.1 — 1.9 
23 20.9 — 2.1 
2 PG] — 2.3 
25 22.6 — 2.4 
The error is thus seen not to exceed I metre per 
second between v’ = 3” and v = 16”, and to be nil 
ee, 
0.1569 ør 
As both the instrument and the modes of observation 
adopted, in conjunction with the varying velocity of the 
wind even in a shorter interval than 30 seconds, will hardly 
admit of determining the velocity of the wind with greater 
exactness than 1 metre per second; moreover, as the mean 
velocity of the wind determined in 1876 was between 9” 
and 10”, and the measured velocities were seldom less than 
3” and greater than 16”; and besides, as the accuracy with 
which the speed of the vessel at the moment of observation 
was determined in 1876, was often not greater than that 
the error ranged from 1 to 2 miles an hour, or 0.”5 to 
when v' 
