The disc calculator, also known as a ready reckoner, data disk or wheel chart is available in a couple of main formats. The most popular and cost effective disc calculator is where you have 2 or 3 discs that spin and reveal answers to questions through apertures that move around as the disc spins.
The disc calculator, also known as a ready reckoner, data disk or wheel chart is available in a couple of main formats. The most popular and cost effective disc calculator is where you have 2 or 3 discs that spin and reveal answers to questions through apertures that move around as the disc spins.
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