These pictures are from Making and Collecting Military Miniatures, a book by Bob Bard and published in the States in 1957. I am indebted to Doug from Unfashionably Shiny for drawing this book to my attention. One chapter considers wargaming at the time in the United States, including rules, on Wellsian lines.
Here Charles Sweet is using (I believe) 30mm figures on a gridded system. There is a pleasing aesthetic to the pictures. Does anyone want to identify any of the figure used?