674 



Subsurface Geologic Methods 



camera fits into the same 4j^-inch-diameter case as the 16-millimeter cam- 

 era. It also has not been field-tested. 



In the discussion of the general principles involved in the design of 

 these deep-well cameras, it was pointed out that the use of as large a 

 water chamber as the well bore would permit was an advantage, because 

 the size of the area photographed at each exposure could thereby be in- 

 creased, and because a better fit between picture window and well bore 

 could be attained. A logical step in this direction might be to build a 



Figure 362. Well-developed primary porosity which may occur in all types of lime- 

 stones; generally the pores are not connected, and rocks of this type do not gen- 

 erally make good reservoirs (2,678 feet). 



series of water chambers of different diameters with the upper heads de- 

 signed to connect to the same standard small-diameter camera housing. 



Reinhold ^ ran his camera into shallow wells on a string of tubing 

 and was thereby able to orient the camera to take pictures in any desired 

 direction, this direction being indicated on the film by a compass located 



* Thomas Reinhold, chief geologist of the Geological Survey Department of Holland. See Haddock, 

 Deep Bore Hole Surveys and Problems, p. 179, New York, McGraw-Hill Publishing Co., Inc., 1931; 

 British patent 226,079 and U.S. patents 1,658,537 and 1,790,678; Colliery Engineering, p. 371, Aug. 1926; 

 and Mining and Metallurgy, Feb. 1932. 



