抄録
It is a matter of common knowledge that, as a habit in evacuating in case of fire, a person tends to try to return to his original place by the route that he used in evacuating. In this report, I saw how accurately he could return to his original position without getting lost. The walking was experimented under the visibility condition that its field of vision be limited to the lower part by the use of a vision limiting cap in the same way to walk through smoke. The test has disclosed the following : (1) About 50% of the subjects fail to return to the original place after turning at three intersections if their field of vision is limited to the lower part as smoke infiltrates. (2) When returning to the original position, 80% of people turn to the correct direction but misjudge distance. People try to remember direction first, rather than distance.
