In 1983 Professor Ivo Kolin of the University of Zagreb in Croatia introduced the first low temperature differential Stirling engine. It ran on the then unheard of low temperature difference of 100 degree C. Thus began a quest by Dr. Senft of the University of Wisconsin and Professor Kolin to determine what the practical lower limit for Stirling engine operation might be. This ended in 1990 when Dr. Senft’s design established a World record by operating on a differential of 1/2 degree C. Since that time Dr. Senft’s basic design has been widely copied and is now probably the most popular design for construction by Stirling engine enthusist. Some have acknowledged Dr. Senft’s work some have not. In order to recognize Dr. Senft’s contribution it is suggested to one and all that this basic design of Stirling engine be designated as the "Senft Stirling Engine."
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