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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. Schema for vertical declining dials - Wikipedia

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

   AV- Angle to vertical? -this is used to fix a starting point, in the final stage of laying out equal hours with a protractor. With a calculator this can be easily be derived from the SD and DL, when using compass and ruler it is a construction base line. It never appears on the final dial. The four basic calculation have a certain symmetry.

4. List of measuring instruments - Wikipedia

   en.wikipedia.org/wiki/List_of_measuring_instruments

   right angles in construction frequency counter: frequency of alternating current: fuel gauge: fuel levels galvanometer: electricity gas pycnometer: volume and density of solids geiger counter: ionizing radiation (alpha, beta, gamma, etc.) glucometer: blood glucose (diabetes) graphometer: angle heliometer: variation of the Sun's diameter hourmeter

5. 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

6. Turn (angle) - Wikipedia

   en.wikipedia.org/wiki/Turn_(angle)

   An arc of a circle with the same length as the radius of that circle corresponds to an angle of 1 radian. A full circle corresponds to a full turn, or approximately 6.28 radians, which is expressed here using the Greek letter tau (τ). Some special angles in radians, stated in terms of 𝜏. A comparison of angles expressed in degrees and radians.

7. Topographic Abney level - Wikipedia

   en.wikipedia.org/wiki/Topographic_Abney_Level

   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 user to see the bubble in the level while sighting a distant target.