No. 863 is an electrically-heated 1400°F (760°C) box furnace from Grieve. Workspace dimensions are 30″ wide x 48″ deep x 30″ high. 52 KW are installed in nickel chrome wire coils supported by a stainless steel frame. A heat resisting alloy recirculating blower powered by a 7-1/2 HP motor with a V-belt drive provides vertical upward airflow.
The unit has 7″ thick insulated walls with stainless steel covers and a motor operated vertical lift door. Inert atmosphere construction includes a continuously welded outer shell, high temperature door gasket, sealed heater terminal boxes, inert atmosphere inlet, and inert atmosphere outlet.
Controls on No. 863 include a digital temperature controller and a 4-point strip chart recorder.