Rossiter W. Raymond 



of the region east of the Yosemite 

 Valley. I had previously developed 

 and tested methods of topographical 

 work, based on triangulation from 

 peak to peak without signals, and 

 gradually expanding the scale of the 

 triangles, until I believed that the 

 system could be applied to very large 

 areas in a country where peaks were 

 sharp, so that the closure of the tri- 

 angles could be made very accurate, 

 compared with what had been done 

 in reconnaisance-work. During that 

 summer we discussed the possibility 

 of carrying across the whole Rocky 

 Mountain system a survey based on 

 rapid triangulation without signals, 

 checked with astronomical work, and 

 with topographical work following 

 the methods which were used in the 

 Yosemite Valley survey and field- 

 work of 1866. We believed that by 

 the application of these improved 

 methods in topography a geological 

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