307 

 Portion 1—2. 



WiLDEBOEK DiEPERINK BaKHUYZEN 



Position A Position B Position A Position B Position A Position B 



I, —99.31 —95.46 —98.59 -9R.73 —97.96 -96.10 



/, 99.61 95.28 98.64 96.02 97,65 96.22 



r, 98.82 95.33 97.95 96.99 97.30 95.69 



r, 99.96 95.18 98.50 96.77 97.69 94.94 



Portion 2 — 3. 



WlLUKL?0ER DiEPEKINK BaKHUYZEN 



Position A Position B Position A Position B Position A Position B 



/, —122.76 —122.00 —122.70 —123.64 —123.52 —122.95 



I, 122.25 122.22 122.26 123.00 122.39 123.03 



r, 122.72 121.72 121.18 121.04 122.85 123.35 



r, 122.00 J 21.46 120.75 J22.24 121.96 122.83 



Portion 3 — 4. 



WiLDEBOER DiEPERINK BaKHUYZEN 



Position A Position B Position .4 Position B Position A Position B 



l^ —144.49 —143.48 —143.28 —143.45 —144.09 —143.22 



/, 144.55 143.58 143.96 143.37 143.93 143.28 



r, 144.91 144.00 144.09 143.69 145.10 144.57 



r, 143.70 144.08 143.98 143.65 144.44 143.48 



In order to eliminate the effect of personal errors the means 

 were now formed from the observation-series ^1 and B, those 

 Mvo series being combined in which the metre was in the same 

 absolute position in space, not relatively to the observer, i.e. Al^ 

 with Bi\, Alj. with B)\, A}\ with Bl^ and Ai\ with BI^. In this 

 manner the following results were obtained : 



Mean 



