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| Scientific American | 2 |
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| Walker, Jearl | 2 |
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Walker, Jearl – Scientific American, 1979
Detailed descriptions are given of two procedures for measuring the radius of the earth, one using a rule and the other a stopwatch. (MP)
Descriptors: Earth Science, Geometry, Mathematics Education, Measurement
Walker, Jearl – Scientific American, 1979
Describes a simple seismograph which can be built quite easily and is sufficiently sensitive to record earthquake waves at home. (HM)
Descriptors: Earth Science, Measurement Equipment, Physics, Science Activities
