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Credit
Chinese/Japanese Pulse Image chart: Long Pulse (changmai). Wellcome Collection. Attribution 4.0 International (CC BY 4.0). Source: Wellcome Collection.
Illustration of Long Pulse (changmai) from Renyuan maiying guizhi tushuo (Pictorial Handbook of Pulse Images Based on the Person). This is a specialist text on pulse diagnosis attributed to the third-century master Shuhe, edited and revised by Shen Jifen in the Ming period (1368-1644). It discusses various pulse images and the medical conditions to which they relate, and contains 48 pulse image diagrams. This undated edition was engraved and published in Japan.
The text states: The pulse image of Long Pulse is as follows. The body of the pulse is relatively elongated. The area over which it can be felt exceeds the three pulse sectors of the wrist -- cun (Inch), guan (Pass) and chi (Foot). It comes and goes fluently, and feels like holding a rod. Long Pulse relates to high fever (zhuangre). When this pulse is found at the renying (Human Welcome) point, it is classed as a slight malignity (weixie) and spontaneous recovery may occur. When felt at the qikou (Qi Opening, i.e. cunkou -- wrist pulse), it indicates that Qi in the viscera is well balanced.