Lucifer Furnaces Inc., Warrington, Pa., released a 4-p brochure on its 5000 Series large, heavy-duty, electric-production furnaces. The brochure includes normal air models (5000 models), atmosphere furnaces designed with alloy muffles (AM Models), removable alloy muffles (RAM models), elevator-quench (EQ models) and atmosphere furnaces constructed with a gas-tight shell (GT models). The brochure describes general construction features, available options and detailed specification charts including chamber dimensions, overall sizes, power requirements and weights for each model.