No. 863 is an electrically-heated 1400 degrees F(~760 degrees C) box furnace from Grieve, currently used for preheating molds. 52 kW are installed in nickel chrome wire coils supported by a stainless steel frame. A heat resisting alloy recirculating blower is powered by a seven and a half HP motor with a V-belt drive. The blower provides upward airflow to the oven. Workspace dimensions are 30" wide x 48" deep x 30" high. The unit has 7" thick insulated walls with stainless steel covers. The oven was specially built with inert atmosphere construction. This consists of a continuously welded outer shell, high temperature door gasket, sealed heater terminal boxes, inert atmosphere inlet and inert atmosphere outlet. Controls onboard No. 863 include a motor-operated vertical lift door and a 4-point strip chart recorder.