Talent in drawing; an experimental study of the use of tests to discover special ability
Herschel T. Manuel's 1919 educational psychology monograph, published by the Public School Publishing Company in Bloomington, Illinois, reporting experiments that used tests to identify special drawing ability in schoolchildren, written for teachers and testing researchers. The plates are vertical score profiles on numbered grids, with solid, dashed, and dotted lines zigzagging across a central axis, useful as ready-made line-chart textures and abstract graph motifs.
