[blindkid] Questions about rulers and perpetual calendars

Richard Holloway rholloway at gopbc.org
Tue Nov 2 14:53:54 UTC 2010


The rulers I've seen and used go down to 1/8th of an inch. At some point, tactile rulers simply would not seem not a realistic option. I suspect the tactile resolution limit would vary from person to person, but how large is a braille dot, for example? That's about 16th of an inch, right? 

Can a larger scale be used for illustration to explain the concept and then larger exhibits might be measured? 2x scale would make a standard 1/8" ruler work if that were an option. We have a second grader with no light perception, so I'm curious to learn what works as I suspect we'll be hearing about this problem here in year or two as well.


On Nov 2, 2010, at 10:37 AM, Wendy Molle wrote:

> Hi!
>    As part of our 4th grade math curriculum, our students need to use rulers that go down to 16ths of an inch AND perpetual calendars.  Does anyone know where we can locate Braille versions of these? 
>     We and our TVI have not been able to find anything.  We tried to make a ruler, but with no success.  When we tried to type in the perpetual calendar to emboss it, it got all garbled and unusable.  Although I am sure it could be sorted out, it would be very time-consuming.  We are hoping that someone knows where we can purchase one.
> Thanks for your help!
> Wendy Molle
> Schoharie Elementary
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