罗马手算盘（便携算盘）
Roman Hand Abacus (Pocket Abacus)
2024-01-17 04:32:03
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Summary
Included here are files for two versions of the Roman Hand Abacus (often referred to as the Roman Pocket Abacus due to its size). It was a portable abacus used by engineers, merchants, and tax collectors to make calculations.
Only four hand abaci are known to have survived ancient times (three bronze & one ivory, the ivory abacus is missing). Replicas exist but are not very common. I made these because I couldn't find a way to purchase one directly and am sharing for those who may have a similar desire to have one of these.
This is a great print for those interested in arithmetic history.
Tags
朋友，你觉得上面这个模型，属于下面的哪个分类？
必须全中文，且长度不超过15
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