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2. Goniometer - Wikipedia

   en.wikipedia.org/wiki/Goniometer

   A protractor is a measuring instrument, typically made of transparent plastic, for measuring angles. Some protractors are simple half-discs or full circles. More advanced protractors, such as the bevel protractor, have one or two swinging arms, which can be used to help measure the angle. Most protractors measure angles in degrees (°).

3. Sliding T bevel - Wikipedia

   en.wikipedia.org/wiki/Sliding_T_bevel

   T bevel with protractor and dividers In use. A sliding T bevel, also known as a bevel gauge or false square [1] is an adjustable gauge for setting and transferring angles. . Different from the square, which is fixed and can only set a 90° angle, the sliding T bevel can set any angle and transfer it on anoth

4. Topographic Abney level - Wikipedia

   en.wikipedia.org/wiki/Topographic_Abney_Level

   The scale is reversible. As shown in the photo, it is set for measuring percent grade. The reverse measures degrees of arc. An Abney level and clinometer is an instrument used in surveying which consists of a fixed sighting tube, a movable spirit level that is connected to a pointing arm, and a protractor scale. An internal mirror allows the ...

5. Combination square - Wikipedia

   en.wikipedia.org/wiki/Combination_square

   The protractor head can be used for: Measuring and checking angles between surfaces, edges, and markings. Marking angles from an edge; Directly transferring angles, like a bevel gauge (sliding T gauge), to minimise measurement errors and inaccuracies. Measuring and marking angles relative to the horizontal by using the spirit level. [2]

6. Theodolite - Wikipedia

   en.wikipedia.org/wiki/Theodolite

   By reversing the telescope and at the same time rotating the instrument through 180 degrees about the vertical axis, the instrument can be used in 'plate-left' or 'plate-right' modes ('plate' refers to the vertical protractor circle). By measuring the same horizontal and vertical angles in these two modes and then averaging the results ...

7. Inclinometer - Wikipedia

   en.wikipedia.org/wiki/Inclinometer

   Measuring the slope angle of a tape or chain during distance measurement. Measuring the height of a building, tree, or other feature using a vertical angle and a distance (determined by taping or pacing), using trigonometry. Measuring the angle of drilling in well logging. Measuring the list of a ship in still water and the roll in rough water.

8. Technical drawing tool - Wikipedia

   en.wikipedia.org/wiki/Technical_drawing_tool

   Various scales and the protractor are used to measure the lengths of lines and angles, allowing accurate scale drawing to be carried out. The compass is used to draw arcs and circles. A drawing board was used to hold the drawing media in place; later boards included drafting machines that sped the layout of straight lines and angles.

9. Schema for vertical declining dials - Wikipedia

   en.wikipedia.org/wiki/Schema_for_vertical...

   A circle marked off in 15° angles is needed (circular protractor). An arbitrary point on the sub-style line is chosen. From here, a long-line, at right-angles to it, is drawn. A line is drawn at right angles from the substyle height, so that it passes through that point. Its length is noted. The length is copied from the point to O'.