that because of the varying conditions and objectives confronting the map-maker. 
On the other hand, photogrammetrists should not be indifferent toward the in- 
vestigation of convergent photography as a more efficient means of meeting the 
growing demands for topographic maps by military and civilian users. In theory, 
it is desirable; in practice, it has worked successfully; and now instruments are 
rapidly becoming available to compile with it. 
  
  
  
| u058J