Under Orson Munn's grandson, Orson Desaix Munn III, it had evolved into something of a "workbench" publication, similar to the 20th-century incarnation of Popular Science.

In the years after World War II, the magazine fell into decline. In 1948, three partners who were planning on starting a new popular science magazine, to be called The Sciences, purchased the assets of the old Scientific American instead and put its name on the designs they had created for their new magazine. Thus