The document provides information about the dimensions and material properties of an electric furnace. The furnace has firebrick walls that are 2m thick with a thermal conductivity of 1.12 W/mK. It also has a quartz observation window that is 5x5x0.6 cm with a thermal conductivity of 0.07 W/mK. Given the inner surface temperature is 1100°C and outer is 121°C, the heat loss from the furnace per unit time is calculated to be 150.523W.