Heating Greenhouses (1923)
This is from Alfred G. King's 1923 text, 500 Plain Answers to Direct Questions on Steam, Hot Water, Vapor and Vacuum Heating.
Take a stroll through HVAC history in our Heating Museum. This section of our website preserves history and answers that so-important question: What the heck is that thing? Whenever you run across anything unusual, chances are you’ll find the old literature about it right here.
This is from Alfred G. King's 1923 text, 500 Plain Answers to Direct Questions on Steam, Hot Water, Vapor and Vacuum Heating.
This is a nice piece from the US Department of Agriculture about greenhouse construction and heating, issued May, 1923.