points. An outstanding example is the approach used and highly 
recommended by Dr. Santoni (1966) which involves spraying the 
object with two coats of varnish, the second being slightly 
darker than the initial one. 
2.2.5.3.7. Emulsion Carrier 
In high precision work, glass plates are preferrable 
over film or film pack. Ultra flat fine grain glass plates 
are highly recommended. 
2.2.5.3.8. Photographic Emulsion 
  
With reference to using small F stops that would require 
faster photographic emulsion, and considering contrast require- 
ments, spectroscopic ll-G or Tri-X Panchromatic emulsions have 
3) 
to the author. 
been recommended by Eastman Kodak Company 
EXPERIMENTAL WORK AT THE UNIVERSITY OF ILLINOIS 
3.1. Introduction 
Fully recognizing the potentialities of the stereometric 
approach, the structural group of the Department of Civil 
Engineering of the University of Illinois requested in 1964 
the cooperation of the photogrammetric group with respect to 
the use of metrical photography and the development of data 
acquisition processes for strains and deflections measurement 
of structural models under testing conditions. 
  
3) Private communication dated July 11, 1967 from Mr. 
J.H. Niemeyer, of the Industrial Photo Methods Product Planning, 
Eastman Kodak Co., Rochester, N.Y. 14650, U.S.A.