What is the reading of the vernier...

🔍 Key Concepts

• Micrometer parts: distinguish the sleeve (barrel) scale, thimble scale, and the small vernier scale on the sleeve used for ten‑thousandths of an inch. • Basic reading rule: total reading = sleeve whole/half turns (0.100, 0.025 in) + thimble reading (each division usually 0.001 in) + vernier reading (each division usually 0.0001 in). • On figure C, pay close attention to which sleeve line is just fully visible to the left of the thimble edge, and which vernier line lines up exactly with a thimble graduation.

💭 Think About

• First, decide what the sleeve reading is: how many 0.100" and 0.025" marks have passed the edge of the thimble on figure C? Which tenth and hundredth of an inch does that place you in? • Next, find which thimble line lies exactly on the sleeve reference line. How many thousandths does that add, and does it put you closer to .47 or .48 in? • Finally, look at the vernier scale: which vernier division lines up perfectly with a thimble mark? How many ten‑thousandths does that add, and how does that help you distinguish between the four choices?

✅ Before You Answer

• Be sure you are not counting any sleeve graduation that is partly covered by the thimble; only fully exposed marks to the left of the thimble edge are included. • Confirm the thimble scale value per division (usually 0.001 inch per line) before multiplying by the number of lines past zero. • When using the vernier, verify exactly one vernier line coincides with a thimble line; multiply its number by the vernier value (commonly 0.0001 inch) and add it last.

What is the reading of the vernier micrometer caliper scale shown in figure "C" in the illustration? See illustration GS-0091.

0.3715 inch

0.4715 inch

0.4725 inch

0.4815 inch

🔍 Key Concepts

💭 Think About

✅ Before You Answer