Conclusion 
  
When the search for an alternative to stereometric photogrammetry as a 
tunnel profiling tool was instigated we hoped to achieve a system that 
reduced field and laboratory time, thus reducing cost and improving 
accuracy. Results show we have succeeded on both counts. 
——2 vu 008 ee 
Hugh Anderson B.K.S. Surveys Limited David Stevens 
12th March, 1982 | 
  
The authors wish to thank Mr. J. A. Walton, Bridge Engineer of the British 
Railways Board and Mr. G. B. Craig, Chief Civil Engineer, British Rail 
(Scottish) for permission to publish this paper. 
28