|
The Iron Pillar located in Delhi, India, is a column in the Qutb complex, notable for the rust-resistant composition of the metals used in its construction. The pillar has attracted the attention of archaeologists and materials scientists and has been called "a testament to the skill of ancient Indian blacksmiths" because of its high resistance to corrosion. The corrosion resistance results from an even layer of crystalline iron hydrogen phosphate forming on the high phosphorus content iron, which serves to protect it from the effects of the local Delhi climate.〔(''On the Corrosion Resistance of the Delhi Iron Pillar'' ), R. Balasubramaniam, Corrosion Science, Volume 42 (2000) pp. 2103–2129. "Corrosion Science" is a publication specialized in corrosion science and engineering.〕 The pillar weighs over 6,000 kg, and is thought to have originally been erected in what is now Udayagiri by one of the Gupta monarchs in approximately 402 CE, though the precise date and location are a matter of dispute. It was transported to its current location in 1233 CE.〔 == Description == The height of the pillar, from the top of its capital to the bottom of its base, is , of which is below ground. Its bell pattern capital is in height, and its bulb-shaped base is high. The base rests on a grid of iron bars soldered with lead into the upper layer of the dressed stone pavement. The pillar's lower diameter is , and its upper diameter . It is estimated to weigh more than six tonnes. A fence was erected around the pillar in 1997 in response to damage caused by visitors. There is a popular tradition that it was considered good luck if one could stand with one's back to the pillar and make one's hands meet behind it. The practice led to significant wear and visible discoloration on the lower portion of the pillar. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Iron pillar of Delhi」の詳細全文を読む スポンサード リンク
|