It's odd for this book to be from 1920 and yet completely free of mention of the war that just happened!

I've been reading through back issues of Popular Mechanics for a project, and was really struck by the ways the 1940s issues were all war war war victory war post-war funding war machines war R&D war war war, and the 1910s/1920s issues were absolutely silent about it. I wonder whether anyone's poked at that cultural phenomenon.