Investigation of the Chisel Discovered at Daitoku-ji Hōjō

Uemura Masako

doi:10.50862/dougukan.35.0_43

A chisel from the first half of the 17th century was discovered at Daitoku-ji temple’s Hōjō. This discovery is significant as a rare example of early modern carpentry tools; visual observations and micro-focus X-ray computed tomography (CT) examinations were conducted. The following summarizes the investigation: 1. The chisel is made from iron with a wooden handle, measuring 233mm in total length and having a blade width of just under 6 bu (17.2mm). The cutting edge is thin and doublebeveled, and the neck is square in cross-section. It is a tang chisel and is equipped with a ferrule. 2. An X-ray CT revealed the shape of the metal component of the chisel, which had a total length of 169.65mm. The tang shape was identif ied as a square pyramid, with each side measuring 8mm. A corrosion residue of 2 .56mm was formed at the tang’s tip, which is speculated to be the cause of the cracks in the handle. 3. X-ray CT observations of the metal component of the chisel suggested there were minimal foreign substances in the material composition of the blade section. Near the neck, several foreign substances measuring 0.2 mm by 4 to 7.2mm were observed parallel to the surface.

Investigation of the Chisel Discovered at Daitoku-ji Hōjō

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