Fifty students divided into twenty-five pairs were studied. Twenty-five of them were taught by the usual method in laboratory while twenty-five were given instruction on the vernier caliper in the library. The following week both groups were given an actual performance examination. The results are surprising.
Proceedings of the Iowa Academy of Science
©1936 Iowa Academy of Science, Inc.
Lapp, C. J.
"On Teaching the Vernier Caliper,"
Proceedings of the Iowa Academy of Science, 43(1), 273-273.
Available at: https://scholarworks.uni.edu/pias/vol43/iss1/90