100 of the period of Jayavarman VII, people were able to expand the internal space of conventional stone corbel arch roofs to over four meters. Visitors to the castle towns of Angkor Wat and Angkor Thom are enthralled by the elegance of the tower and its masonry techniques. On observing the bonds between the processed stones, we see that they have been joined together so precisely that even razor blades are unable to enter between them, and what amazes us are the techniques of stone processing and masonry, which in terms of modern-day common sense are incredible. The adjusting of the stones to each other is carried out by the addition of small amounts of water and sand. This too is a traditional technique and it does not require adhesives. Among the stone processing technologies utilized for temples built of stone, we have besides others: (1) “Stone Transportation Techniques.” (2) “Stone Stacking Techniques.” (3) “Stone Grinding Techniques.” (4) “Earth and Sand Construction Techniques.” These 4 techniques are presented in the relief illustrations in the outer corridor of the Bayon Temple. Nonetheless though, as regards the procedure utilized for masonry construction by means of these traditional techniques, and the type of construction method used at the site, the issues have not yet been clarified. Yet when we think about it, laterite, earth and sand, river sand, and so on can be obtained in large quantities near the construction site. For example, large amounts of earth and sand can be obtained from the digging of moats, laterite can be obtained from nearby fields, and river sand can be obtained from the Siem Reap River. Thus building materials are available in the immediate vicinity. However, only sandstone has to be borne from the Ishikiri (stone cutting) site, which lies around 30 kilometers away. Here people took advantage of floods in the rainy season, placing more than half of the sandstone in the water and using floatation to send the rafts downstream. Judged from the angle of building materials like these, the edifice might possibly
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