In June, 1952, the Bell Telephone Laboratories, Murray Hill, New Jersey, sponsored a summer school for teachers of transistor physics. During the sessions the basic ideas of semiconductors were studied, and a series of fundamental experiments was performed. At Carnegie Institute of Technology the student interest in these experiments has been very high and the results were so gratifying that we felt it would be most welcome if the Bell Telephone Laboratories made these experiments available to colleges which were not represented at the transistor sessions. This they have kindly agreed to do. A brief discussion of the experiments developed by the Bell Telephone Laboratories is given in this article.