L7 
Residuals in Y at 1:15,000: 
Error Frequency Relative accumulative frequency 
mm. % mm. 
0 29 26 0 
0:1 42 64 < 0-1 
0-2 17 79 «0:2 
0:3 14 92 < 0-3 
0:4 6 97 < 04 
0:5 2 99 < 0-5 
0-6 1 100 < 0-6 
111 
my 0-19 mm; at 1: 15,000 
— 0:07 mm. at picture scale 
== 3-1 yards on the ground 
X and Y components combined into vector residuals: 
Error Frequency Relative accumulative frequency 
mm. % mm. 
0 11 10 — 0 
0:1 33 40 « 0:1 
0:2 31 68 x: 0:2 
0:3 21 87 «0:3 
0:4 7 93 < 0-4 
0:5 6 98 < 0-5 
0:6 2 100 x 0:6 
111 
The following residual discrepancies were found on the stereoscopically transferred 
tie points after the internal adjustment (error in mm. at 1:15,000): 
Error Frequency 
mm. X 
0 34 40 
0-1 57 56 
0-2 35 29 
0:3 7 10 
0:4 2 
135 135 
my = 0:15 mm.; m, — 0:14 mm. at 1:15,000 
1, — 0:09 mm. ; m, — 0:08 mm. at picture scale 
The detail plotting was carried out at 1:25,000, so that the errors expressed in 
terms of machine scale were reduced by 60%. No trouble was experienced in fitting 
the models afterwards to the adjusted positions of the pass points. 
I wish to express my appreciation of the assistance and encouragement received 
from my senior officers and colleagues in the Department of Lands in the presenta- 
tion of this paper, and my thanks to the permanent head for permission to publish 
it, making full use of official records in connection with the results obtained by the 
method.