Another early source, from the time-and-motion studies pioneers: Process Charts, Frank B. Gilbreth, Lillian M. Gilbreth (1921), American Society of Mechanical Engineers. It's available at https://archive.org/details/processcharts00gilb . Among its symbols are "moved by boy" and "moved by messenger boy". David Hemmendinger hemmendd@union.edu Professor Emeritus http://athena.union.edu/~hemmendd Computer Science Dept. +1 518 346 4489 Union College, Schenectady, NY 12308 FAX: +1 518 388 6789
Flowcharting was borrowed from industrial engineering. You can find examples in textbooks of the era. Henry Leffingwell's writings on office management have some interesting diagrams that could be considered precursors to flowcharting but they were almost certainly not known to Goldstine et al. I would suggest looking at the Log for the penn differential analyzer or the Ucla differential analyzer to see if they treated problems the same way.