Today on Modern Mechanix: this giant megaphone that was used to call reveille at Fort Jackson, S.C. I'm not sure why they didn't invest in an amplifier but it sure looks neat. In 1941 a million people paid 10 cents just to sit on a concrete apron and watch all of the planes take off and land at La Guardia airport, dubbed "The Grand Central of the Airways" in this beautifully illustrated Popular Mechanics article. We also have an automatic egg breaker that can break 3,600 eggs an hour, a mobile grocery store packed into a bus and a robot rat from 1935 that can (sort of) navigate a maze. Lastly, for all the women out there who want to make a bold fashion statement, be sure to check out this 1941 monocle veil.