What Is The Description Of Protractor?

In land surveying, a bearing is the clockwise or counterclockwise angle between north or south and a direction. … In surveying, bearings can be referenced to true north, magnetic north, grid north (the Y axis of a map projection), or a previous map, which is often a historical magnetic north.

Why is it called a protractor?

protractor (n.)

1610s, “one who lengthens (an action),” Modern Latin agent noun from Latin protrahere “to draw forward” (see protraction). Medieval Latin protractor meant “one who calls or drags another into court.” The surveying sense of “instrument for measuring and drawing angles on paper” is recorded from 1650s.

How are Clinometers used?

A clinometer is a tool that is used to measure the angle of elevation, or angle from the ground, in a right – angled triangle. You can use a clinometer to measure the height of tall things that you can’t possibly reach to the top of, flag poles, buildings, trees.

How is a protractor made?

Fold a triangle with one edge from the upper left corner of the paper to the bottom center of the paper. This will create a 60º angle. Create the same fold from the right side to create a 120º angle. Mark these angles on your protractor.

Where are bearings used in real life?

Ball bearings are used in refrigerators, air conditioning units, ovens, dishwashers, generators, washing and drying machines, microwaves, blenders, ceiling fans, vacuum cleaners, food processors, and even in kitchen or bathroom drawers.

What are the 16 compass points?

On a compass rose with ordinal, cardinal, and secondary intercardinal directions, there will be 16 points: N, NNE, NY, ENE, E, ESE, SE, SSE, S, SSW, SW, WSW, W, NWN, NW, and NNW.

What are 2 uses of a protractor?

We use a protractor to measure angles. Architects and designers use a more precise protractor called an angle protractor tool which gives more accurate measures. A compass helps to construct an angle. Set squares, also known as triangle protractor, are used to draw parallel and perpendicular lines.

Can a person be a protractor?

a person or thing that protracts. (in surveying, mathematics, etc.)

What angle is 45?

A 45-degree angle is exactly half of a 90-degree angle formed between two rays. It is an acute angle and two angles measuring 45 degrees from a right angle or a 90-degree angle. We know that an angle is formed when two rays meet at a vertex.

Why do protractors have two scales?

The two scales make it easy for us to measure angles facing different ways. To measure the size of angle ABC, place the protractor over the angle so that the centre of the protractor is directly over the angle’s vertex, B; and the base line of the protractor is along the arm, BA, of the angle.

What is average life of bearing?

Average life –median lives of groups of bearings are averaged–somewhere between 4 and 5 times the L10 life. The constant radial load which a group of bearings can endure for a rating life of 1 million revolutions of the inner ring (stationary load and stationary outer ring).

How do you calculate bearing life?

Bearing Rating Life Calculation

  1. C = Dynamic Capacity (dN or Lbs)
  2. P = Equivalent Bearing Load (N or Lbs)
  3. N = Rotating speed in RPM.
  4. e = 3.0 for ball bearings, 10/3 for roller bearings.

What is E in bearing?

RS – Bearing with rubber seal on one side, one side open. 2 Z / ZZ – Bearing with a metal seal on both sides. Z – Bearing with a metal seal on one side, one side open. E – Reinforced Design. P2 – Highest precision.

What are 3 figure bearings?

Three-figure bearings

  • Imagine that you are in a boat at sea. You are lost and you cannot see any land.
  • A bearing is a direction. …
  • The points of the compass can be written as 3-figure bearings:
  • In navigation on sea, land or air it is three figure bearings that are used more often than the points of the compass.

What are common applications of bearings?

Bearing Applications

  • Aviation Cargo Systems.
  • Aerospace Wing Actuators.
  • Anemometer.
  • ATMs & Card Readers.
  • Bicycles.
  • Commercial Blenders.
  • Dental Hand Tools.
  • Electrical Motors.

What are three things that use ball bearings?

Part of our everyday life, ball bearings are found in things such as blenders and exercise equipment. The list goes on and on. Bicycles, DVD players, water pumps, washing machines and fans are just a few of many day to day products that we use that use ball bearings.

What is a real world example of a plane?

Examples of a plane would be: a desktop, the chalkboard/whiteboard, a piece of paper, a TV screen, window, wall or a door.