Characterizing the sealing materials of the merchant ship Nanhai I of the Southern Song Dynasty

Nanhai I is a highly valuable shipwreck of the Southern Song Dynasty for studying various topics, including the shipbuilding techniques. The sealing materials are of significant importance to ensure the ship’s reliability during the voyage across the ocean and they were rarely analyzed. Therefore, the sealing materials of this ship were analyzed by several analytical approaches. The sealing materials included two types, i.e., gap filler with jute fibers and surface coating without any oakum. The main components of both types of putty are calcite with minor Tung oil. The weight ratio of Ca(OH)2/Tung oil range from 4.3:1 to 7.9:1 for surface coating samples and the weight ratio of Ca(OH)2/organics is 3.1:1 for the gap filler sample. Additionally, we first find that the surface coating has a layered structure, where outer layers contain more Tung oil than inner layers. The innermost layer of the surface coating sample might be altered by organic acids from wood deterioration, causing its loose structure and grey color. The composite layers with different formula might be a result of balancing the costs and performances of the putty.

The “Emperor’s Edict” and the Emperor’s power in the Southern Song Dynasty

“Emperor’s Edict" refers to the writing of emperor himself. In the context of serving as official document, it refers to the special writ issued by emperor for sake of administering national affairs. In the official document system of Song Dynasty, "Emperor’s Edict" had always been an attention of the scholars and officials at that time due to its unusual functions in terms of drafting, promulgation and power. The Southern Song Dynasty was generally conceived by academic circles as a period when the "Administration by Emperor’s Edict" was gradually phased out. We did observe, however, with “Emperor’s Edict” placed in historical panorama of the early years of Southern Song Dynasty, an ever-strengthened power and prowess of “Emperor’s Edict” as backlit by several historical incidents such as Emperor Gaozong’s controlling and manipulating by “Emperor’s Edict” of the national armies. It reflects the political truth of strengthened imperial power in the Southern Song Dynasty. Hence, we can have access to another facet of the politics of the Southern Song Dynasty.