ねじ概念の起原

抄録

Once upon a time, a primitive man was gathering the shellfishes for food. He found a conch. He pierced and turned a stick in order to take out the flesh. This is said to have been the first moment that human being encountered the screw. On another opportunity, a mankind had found that trees were coiled around by ivy or vine in a forest. It is said that the idea of screw spiral or helix was invented by this observation. Furthermore, authors consider the snake myths that distributed over the Eastern and Western world will be another origin of the idea of screws. Screw is indispensable as a present-day machine element. To the origin of the screw, nature and myths will be considered. In this paper, origin and development of the concept of screws in the ancient Greco-Roman world, Asia Minor, Mesopotamia, China, and Japan are researched from the results of fieldwork and reference's investigation.