VOL. 8, NO. 5
A CLASS PROJECT
909
A CLASS PROJECT TO ACCOMPANY THE STUDY OF GYPSUM AND CEMENT During the study of gypsum and cement, the students in my class suggested and carried out the following project. One of the students volunteered to act as a model for a plaster cast. He closed his eyes, his face was greased well with vaseline, and then daubed, except for his nostrils, with wet plaster of Paris. He sat quietly for ten or fifteen minutes, after which time the cast was removed by some of the students. When it was thoroughly dry, it was vaselined and filled with a fine-grained mixture of wet concrete. This set, and the plaster mold was then chipped off. The likeness, with closed eyes and immobile lips, was rather weird.
