The author repliesWilliam Dillion Walsh Citation: The Physics Teacher 15, 518 (1977); doi: 10.1119/1.2339758 View online: http://dx.doi.org/10.1119/1.2339758 View Table of Contents: http://scitation.aip.org/content/aapt/journal/tpt/15/9?ver=pdfcov Published by the American Association of Physics Teachers Articles you may be interested in The author replies Phys. Teach. 22, 208 (1984); 10.1119/1.2341525 The author replies Phys. Teach. 21, 282 (1983); 10.1119/1.2341287 The author replies Phys. Teach. 14, 196 (1976); 10.1119/1.2339351 The author replies Phys. Teach. 13, 325 (1975); 10.1119/1.2339169 Authors' Reply Rev. Sci. Instrum. 39, 1391 (1968); 10.1063/1.1683695

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