N54 20. 2(dx, *dx,,tdx, ,*dx, ,*dx,,) - (dx., +dx Tdxj,t'dx, ,ldx +
22 23 24 25)
+ (dx,,+dx
41 a2t94*4 +dx atdx
ahd, + 2(dx | +dx, ,tdx,
51! dX55 dx, ,tdx, idx,,) -
2dy, 1 9y 45 *dy 4 4*2dy, ;-2dy, 1 dY55*dy, ,*2dy,, -2dy, 1 9Y5» +
45)
=
dy 4 4*2dy 45-2dy 4, -dy ,5*dy, ,*2dy ,,-2dy, -dy , tdy, ,*2dy,,
Nyc y= -Z(dx, *dx,,tdx, ,*dx, ,*dx,,) = (dx,,tdx,,+dx,2+tdx,,+dx,,) +
+ (dx, *dx,5*dx,,tdx,,tdx,,.) + 2(dx, tdx, 7 tdx, 3 +dx, 4 dx, 5)
Q zo ard
xo YoJo 25
Q -Q am
m m. m m. 50a
Q - 1
go 50a
Q rol
BB 25a
Q nee
af 50a
er 3 Lax) sevi"... v. PN, iig i C vo
vv] = [dx^]^* (dy^]:- —áom à BI) 5—53—5 | 50
The standard error of unit weight is
er FPE
ST AZ.
The standard error of the standard error of unit weight is
S = = 0.118,
2, Measurements of parallaxes.
Two grids of high and known precision are adjusted in the plate holders of the
Stereocomparator. The differences between the x- and y-coordinates of the
grids are measured as x- and y-parallaxes respectively. Each parallax is
determined as the average of for instance three settings. These parallaxes
can be corrected with respect to the known coordinate errors of the grids.