The basic information, about a given ***** gauge, is as follows:
(i) Least division on the main scale = 0.5 mm
(ii) No. of divisions on the circular scale = 100
(iii) Distance moved, on the main scale, when the ***** is given 7 complete rotations = 3.5 mm
(iv) Circular scale division, coinciding with the line of graduated (reference) line, when the ‘jaws’, of the ***** gauge, are just in contact = 97
When a wire is just held in contact with the jaws of the ***** gauge, the main scale reads 0.45 mm. The circular scale division, just coinciding the reference line, is the 33rd division.
The zero error, and the corrected value of the radius of the wire, are equal, respectively, to
(1) + 0.0015 cm and 0.0308 cm
(2) – 0.0015 cm and 0.0315 cm
(3) – 0.0015 cm and 0.0308 cm
(4) + 0.0015 cm and 0.0030 cm
