Simplified Abacus with PVC Pipes

Screen Shot 2018-10-30 at 12.23.44 PMScreen Shot 2018-10-30 at 12.23.19 PMScreen Shot 2018-10-30 at 12.24.54 PM

Material: PVC pipes (Actual inside diameter (in.).609, Actual outside diameter (in.) .84), wood strips, dowels, wood glue

 

Reference:

1920px-abacus_5.jpg

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