| 摘要 |
A proportional ruler for dividing a length into equal parts or converting a given length into a proportional length comprises a standard ruler scale and proportional scales with specific proportional coefficients. While a standard ruler scale gives a reading of actual length of an object, proportional scales will give a length equal to the actual length over the proportional coefficient. If a proportional coefficient is a whole number, the scale can be used as a divider to divide a length into the whole number of equal parts.
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