| 摘要 |
An adjustable radial curve radius setting scale is provided having an end supporting bar to which there is attached an assemblage of stacked elements. The stacked elements are fastened together by pin assemblies so that they move independently of each other. The stacked elements are attached to the supporting bar and are adjustable relative thereto. A ruling edge is attached to the stacked elements for creating a curve upon manipulation of the stacked elements. A bar scale is attached to the supporting bar and to the stacked elements so that the user of the instrument may set or determine the exact radius of a curve created by the instrument. The bar scale may be removable by the provision of a locking device which would function to lock the ruling edge to the ruling arm assembly. A base having at least one guideway is provided for the radial curve whereby radii of particular dimensions may be constructed. A transparent cover is provided for the base.
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