The kids pictured would have been about my Dad's age in 1941

 I saw this picture on Fah-che-book:

From this article in February 1941 Popular Mechanics, page 298:

continued here:

 The article can be found on Archive:

https://archive.org/details/sim_popular-mechanics_1941-02_75_2/page/298/mode/2up?view=theater

or on Google:

 https://books.google.ie/books?id=ytkDAAAAMBAJ&printsec=frontcover&source=gbs_ge_summary_r&redir_esc=y#v=onepage&q&f=false

One of these days I have to try building a regen !

Best Regards,
Chuck, WB9KZY
http://wb9kzy.com/ham.htm