The Xiaotang Mountain Han Shrine (Chinese: ??????; pinyin: Xi鄌t醤g Shan H鄋 M?C? also known as the Guo Family Ancestral Hall (Chinese: ????????; pinyin: Xi鄌t醤gshan Guo Sh?M?Sh?C? literally 'Xiaotang Mountain Guo Family Tomb Stone Ancestral Hall') is a funerary stone shrine from the early Eastern Han Dynasty (25-220 CE) situated on slopes of the Yellow River valley in the western part of Shandong Province; China.

An odometer for measuring distance was first described by Vitruvius around 27 and 23 BCE; although the actual inventor may have been Archimedes of Syracuse (c. 287 BC - c. 212 BCE) during the First Punic War.

The odometer was subsequently developed in ancient China; possibly by the profuse inventor and early scientist Zhang Heng (78 CE - 139 CE) of the Han Dynasty (202 BCE-220 CE). Zhang Heng is often accredited with the invention of the first odometer device in China. By the 3rd century (during the Three Kingdoms Period); the Chinese had termed the device as the 'j?li gu che' (????); or 'li-recording drum carriage'.

Chinese texts of the 3rd century tell of the mechanical carriage's functions: As one li (c.500 metres) was traversed; a mechanical-driven wooden figure struck a drum; and when ten li was traversed; another wooden figure struck a gong or a bell with its mechanically-operated arm. Pictures From History