Name the part to which the depth bar of a Vernier calliper is attached. 

Explanation:

Vernier caliper:

• A vernier caliper is defined as a measuring device that is used for the measurement of linear dimensions.
• It is also used for the measurement of diameters of round objects with the help of the measuring jaws.
• The least count of vernier calipers is also known as the vernier constant.
• It is defined as the difference between one main scale division and one vernier scale division.
• A vernier caliper is a precision measuring instrument. It is used to measure up to an accuracy of 0.02 mm.

Parts of a vernier caliper:

Fixed jaws (1 and 2):

• Fixed jaws are part of the beam scale. One jaw is used for taking external measurements, and the other for taking internal measurements.

Movable jaws (3 and 4):

• Movable jaws are part of the vernier slide. One jaw is used for external measurements, and the other for internal measurements.

Vernier slide (5):

• A vernier slide moves over the beam and can be set in any position by means of a spring-loaded thumb lever.

Beam (6):

• The vernier slide and the depth bar attached to it slide over the beam. The graduations on the beam are called the main scale divisions.

Depth bar (7):

• The depth bar is attached to the vernier slide and is used for the measurement of depth.
• The depth bar of a Vernier caliper is attached to the movable jaw.

Thumb lever (8):

• The thumb lever is spring-loaded which helps to set the vernier slide in any position on the beam scale.

Vernier scale (9):

• The vernier scale is graduated and marked on the vernier slide. The divisions of this scale are called vernier divisions.

Main scale:

• The main scale graduations or divisions are marked on the beam.