I have an undated article from the “Handbook of Construction Techniques,” which McGraw Hill once published. The title was “Keeping a Cool Head.” Consider this in hindsight:
After experiencing severe headaches wearing his metal helmet in the hot sun, Ray Vaught, a foreman with E.E. Barber & Sons of Texarkana, Arkansas, came up with a cool idea to take the heat off his head. He put a one-foot-square piece of 3/16-thick asbestos cloth inside his hat as an insulator.