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Homemade Wooden Vernier Scales for Use by Blind
1.No similar device produced for the visually impaired turned up when doing a fairly thorough web search.
3.For additional ideas about teaching blind students, see Michelle Parry, Mark Brazier, and Ephraim Fischbach, “Teaching college physics to a blind student,” Phys. Teach. 35, 470 (Nov. 1997) and
3.George F. Spagna Jr., “Teaching astronomy for the blind: Providing a lecture and laboratory experience,” Am. J. Phys. 59, 360 (April 1991).
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Because she had been blind since birth, we knew that our new student, Cricket,
would be unable to make the necessary measurements needed to get any meaningful
lab data while all of the other students would be able to use highly accurate
commercial Vernier calipers. All we had on loan for Cricket was a Brailled
plastic tactile meterstick with low resolution divisions to the nearest whole
centimeter. This was unacceptable, considering that the other students were
achieving very accurate and consistent readings with their analog Vernier
calipers to the nearest 0.005 cm. So using the Vernier scale concept, we decided
to make a low-tech tactile wooden “Vernier caliper” that would
have much more resolution and be quick and easy to use by anyone, even if
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