| 摘要 |
The specification discloses a device for detecting movement of two portions of a structure relative one another. The device comprises a first disc defining a radial scale and fixedly securable to the first portion of the structure and a second disc fixedly securable to the second portion of the structure. A telescoping linear scale extends between and is pivotally secured to the center of the radial scale and to the second disc. Consequently, the angular orientation of the telescoping scale with respect to the first disc is displayed on the radial scale; and the distance between the disc members is displayed on the linear scale, providing a measurement of movement between the structural portions. Also disclosed is a method of detecting structure movement comprising securing the device to the two portions of the structure and monitoring subsequent readings displayed on the radial and linear scales.
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