Backward Vernier scale

 

• Length A0 represents 10 cm and is divided in to 10 equal parts each representing 1 cm.
• B0 = 11 (i.e. 10+1) such equal parts =  11 cm.
• Divide B0 into 10 equal divisions. Each division of B0 will be equal to 11/10 = 1.1 cm or 11 mm.
• Difference between 1 part of A0 and one part of B0 = 1.1 cm -1.0 cm = 0.1cm or 1 mm.

 

Question: Draw a Vernier scale of R.F. = 1/25 to read up to 4 meters. On it show lengths 2.39 m and 0.91 m

 

• Length of Scale = (1/25) × (4 × 100) = 16 cm
• Draw a 16 cm long line and divide it into 4 equal parts. Each part is 1 meter.  Divide each of these parts in to 10 equal parts to show decimeter (10 cm).
• Take 11 parts of dm length and divide it in to 10 equal parts. Each of these parts will show a length of 1.1 dm or 11 cm.
• To measure 2.39 m, place one leg of the divider at A on 99 cm mark and other leg at B on 1.4 mark.  (0.99 + 1.4 = 2.39).
• To measure 0.91 m, place the divider at C and D (0.8 +0.11 = 0.91).