DEVICE FOR GENERATING HAZE ON PHOTO MASK

摘要

A device for measuring extension of the ground is provided to improve endurance of the device as well as to reduce manufacturing cost and installation cost. A device for measuring extension of the ground includes an anchor(10), a post(20), a scaled plate(30), rollers(40), a wire(50), and a display scale(60). The anchor is fixed to the dangerous ground around a sinkhole. The post is installed at a stable ground(3) spaced apart from the dangerous ground. The post is elongated upward from the stable ground. The scaled plate is fastened to a sliding post(22) by a bolt(B). The rollers are installed to be rotatable with respect to the post. The wire is formed of a metal material such as steel, and one end of the wire is coupled to the anchor. The display scale is coupled to the wire.