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EXAGGERATED PROFILE PLOTTER, NEW TCOL IN GECLCGIC 
INTERPRETATION OF AERIAL PHOTOGRAPHS* 
Charles L. Pillmore 
U. S. Geological Survey 
ABSTRACT 
The exaggerated profile plotter was designed for drawing vertically 
enlarged profiles from aerial photographs of areas in the Black Hills, 
Wyoming. It was used primarily as an aid in correlating and tracing 
geologic units between field measured stratigraphic sections. The 
instrument can be used with any double-projection stereoscopic 
plotting instrument. 
* Publication authorized by The Director, U. S. Geological Survey