For the purpose of studying the rapid developmental changes which take place in growing children, we have been impressed with the desirability of having a method which would combine three essential characistics: first, a record which would possess permanency; second, a type of record which would permit actual visualization of the child, and finally, a record which would make possible the securing of comparative measurements. A photographic method suggested itself as a possible means of combining these characteristics and in addition of affording a method of accomplishing these results with great rapidity.
Visualization has impressed us as one of the most desirable of these characteristics, since a visual picture of a child conveys at once a definite idea of the nutritional status, whereas figures alone do not call forth a definite mental picture. The most accurate method of visualization, in our opinion, is through the agency of a stereoscopic photograph
CLOUGH HD, MURLIN JR. PERMANENT RECORDS OF GROWTH AND NUTRITION OF CHILDREN. Am J Dis Child. 1928;36(3):425-433. doi:10.1001/archpedi.1928.01920270002001