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Firwin also developed an innovative method of covering the entire 40 ft. long tank of a military tanker truck with a removable, reusable insulation blanket. The tanker truck was designed to maintain water at a comfortable drinking temperature for front line troops under all weather conditions. The cover was primarily engineered for energy conservation, as the small onboard auxiliary generator set, used to provide power for the heating and refrigeration unit, would otherwise not be able to effectively heat or cool the water. Insulation blankets have generally been considered a somewhat mundane, but necessary part of many engine applications. The concept was simple; part of the engine was hot, the manufacturer didn''t want somebody leaning on it and getting burned, so a blanket was put over the hot spot.

Molten pig iron is a relatively impure alloy of iron, with about 4 percent carbon and other materials. It is used chiefly as a primary ingredient of steel, but is also used for many finished products such as pipe fittings and structural castings. However, these products are rarely made directly from blast furnace iron. In most cases, the cold pig iron is re-melted in brick or refractory lined cupolas or malleable iron furnaces. In these lined furnaces the quality and analysis of the iron can be more accurately adjusted and controlled, before casting the metal into final form.