Question

using the pictures of the micrometer, determine the measurement to the thousandth of a millimetre.
a.
reading:

Explanation:

Step1: Identify main - scale reading

The main - scale reading on the micrometer is 10.5 mm. The main - scale has markings in millimeters and half - millimeters. Here, the thimble edge is past the 10.5 mm mark on the main scale.

Step2: Identify thimble - scale reading

The thimble scale has 50 divisions, and each division represents 0.01 mm. The 47th division on the thimble scale is in line with the horizontal reference line on the main scale. So the thimble - scale reading is $47\times0.01 = 0.47$ mm.

Step3: Calculate total measurement

Add the main - scale reading and the thimble - scale reading. The total measurement is $10.5+0.47 = 10.97$ mm.

Answer:

10.970 mm