An Analysis of the “Huai-ruler”

This article synthesizes the viewpoints of multiple historians regarding the “Huai-ruler” measurement unit. Through extensive analysis and comparison of relevant historical literature, it explores the possible length ranges of the “Huai-ruler” during different historical periods after the Tang Dynasty. Additionally, it investigates the evolutionary relationship of the “Huai-ruler” length and establishes its range as 32.5-34.7 centimeters. To further examine this topic, the article conducts a quantitative analysis of “Huai-ruler” samples obtained from recent field surveys of carpenter rulers. By analyzing the overall characteristics of the length variations, the article categorizes the “Huai-ruler” into primary and secondary clusters. The distribution of these clusters is presented using GIS technology. Furthermore, the article provides a preliminary summary of the observed distribution patterns among the “Huai-ruler” samples, along with an analysis of the underlying historical factors from the perspectives of regional evolution and migration. Studying the “Huai-ruler” issue not only contributes to exploring the unique construction logic that may exist in the Huai region but also provides valuable evidence for researching the zoning of rural architecture in the entire southern region.