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Homemade Adding Machine

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GMS_012317_4.jpg ThumbnailsMany 2nd and 3rd graders had never heard a dial tone!ThumbnailsMany 2nd and 3rd graders had never heard a dial tone!ThumbnailsMany 2nd and 3rd graders had never heard a dial tone!ThumbnailsMany 2nd and 3rd graders had never heard a dial tone!ThumbnailsMany 2nd and 3rd graders had never heard a dial tone!

Greenmount student and her mother showing a calculator made by the student's grandfather. It is similar to an Adiater, and I was able to teach them how it works.