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Do you use the top or bottom numbers on a protractor?

To measure an angle you put the rough side of the protractor down then put the vertex of the angle in the little hole in the middle, (shown on pages 3 and 4) and if the angle is acute you use the numbers on the bottom on the right but if it is acute but it is pointing to the left you use the left side and the top ( …

What is a double protractor?

A “Cras Navigation Plotter” double-protractor, in foreground, named after his inventor Jean Cras. A half circle protractor marked in degrees (180°). A set square with integrated protractor (180°).

How many set of measurements does a protractor have?

The protractor is in the shape of a semicircle. The semicircle is divided into 180 equal parts which show angle measurements from 0° to 180°. The protractor has two sets of measurements.

How do you read a vernier scale?

Follow these steps to read the vernier scale:

  1. Read the main scale. Look for the last whole increment visible before the 0 (zero) mark.
  2. Read the secondary scale (Vernier) measurement. This is the division tick mark that lines up best with a mark on the main scale.
  3. Add the two measurements together.

How do you read a vernier caliper 0.05 mm?

The vernier scale can read to 0.05 mm. So using both scales, the width can be read to the nearest 0.005 cm (or 0.05 mm). To measure the width, you read the top and bottom scale as follows: Find where the 0 mark of the vernier scale lines up on the main scale.

What is the reading on the vernier calipers?

Vernier caliper scales; main at top, vernier at bottom. It reads 3.58 ± 0.02 mm by adding 3.00 mm (left red mark) on the fixed main scale to vernier 0.58 mm (right red mark). The main scale reading is that to the left of the zero on the vernier scale.

What is vernier caliper with diagram?

The VERNIER is a small movable graduated scale for obtaining fractional parts of subdivisions on a fixed main scale of any measuring instrument. With a normal scale, we may be able to measure down to 0.50 mm or while with a vernier scale the least count maybe 0.10 mm.

What is meant by Vernier?

(Entry 1 of 3) 1 : a short scale made to slide along the divisions of a graduated instrument for indicating parts of divisions. 2a : a small auxiliary device used with a main device to obtain fine adjustment.

How many parts are there in vernier caliper?

On an imperial caliper with a main scale of 6 inches, the vernier scale is 0.6 inch long, and is divided into 25 parts. Each increment has a length of 0.001 inch.

What are the 10 basic parts of a caliper?

Vernier Caliper Functions & Important Parts

  • Lower Jaws:
  • Upper Jaws:
  • Depth Rod:
  • Main Scale:
  • Vernier Scale:
  • Thumb Screw:
  • Lock Screw:

What are the types of vernier scale?

Vernier calipers have two types of scales- a fixed main scale and a moving Vernier scale. The main scale is normally in millimetres or 1/10th of an inch. Vernier calipers score well over standard rulers because they can measure precise readings up to 0.001 inches.

How many types of Vernier are there?

three types