Sliding T bevel
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A sliding T bevel is an adjustable gauge for setting and transferring angles. The handle is usually made of wood or plastic and is connected to a metal blade with a thumbscrew or wing nut. The blade pivots and can be locked at any angle by loosening or tightening the thumbscrew.
The procedure for usage is to set the T bevel from an existing angle (or set it using a protractor), and then transferring the tool for duplication of the angle.
[edit] Source
Reader's Digest "Book of Skills & Tools"