Context:

A psychological experiment conducted by the army through Eastman Kodak Company advertisements as explained by Robert Yerkes in 1912. 

Reference:

Yerkes, R. M. et al. (1912) ‘The class experiment in psychology with advertisements as materials’, Journal of Educational Psychology. Warwick & York, 3(1), pp. 1–17. doi: 10.1037/h0072656.

Download:

The Class Experiment in Psychology- Robert Yerkes