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  The year was 1924 when a daunting problem faced companies in the materials processing industry. Their combustion-heated furnaces were incapable of providing the controlled atmosphere required to process advanced new materials.

Determined to find a solution, a young engineer and an electric company executive conceived a better heating method. They developed an electric-resistance-heated furnace capable of meeting the stringent new process requirements. The Harper Electric Furnace Corporation was born.

Offering precise control of atmosphere and temperature, Harper furnaces quickly became a quality standard among material processors and the forerunner of many innovations to come.
The HARPER Rotary Tube Furnaces: Exceptional Versatility, Reliability and Energy Efficiency