National Geographic : 1927 Dec
After 3 hours for in town is your house CHILLY because "the fire had to be banked"? , " . oU i'' ti' Have more comfort -for 1/3 less fuel Cleaner O RDINARILY, you dare not keep drafts on when you leave for an afternoon or evening "in town." The fire may burn itself out before you get back. So you bank the fire and turn off the drafts. In half an hour the Furniture radiators grow cold. When you get home the house is chilly. It takes an hour to get up a A clever invention ends this. Merely by °" replacing the air-venting valve on each of 11O ' your radiators with a Hoffman No. 2 Vacuum w Valve you have hot radiators 3 hours (not 30 minutes) after banking. You get up steam in OT1 15 minutes (not an hour)-and save 3 your W OrKL fuel. By this saving, you earn 50% to 65% on your Hoffman No. 2 Vacuum Valves-the first year. At the end of the second, you have your investment back-plus a profit. Every year, after this, you save $5.00 on each radiator. Send for book-Like any investment, this one is worth studying. For complete details (ex plaining the clever invention that makes this -- c f amazing comfort and fuel saving possible) send for interesting illustrated book, "How to Lock Out AIR-the heat thief." Just print your name and address on the edge of this ad and mail to Hoffman Specialty Co., Inc., Dept. BC-2, 25 West 45th St., New York. Use HOFFMAN No.2 edar VACUUM VALVES "Mention the Geographic-It identifies you."