QURRICULAR

A screw gauge that lies

Maryam · Physics 9 · Unit 1 — Physical Quantities and Measurement

Instruments

Tap to place on the bench

Nothing on the bench moves under a force. Each instrument carries its own scale, and its least count is set on the instrument itself.

Screw GaugeA-12A-19
0–12.5 mm · 0.01 mm0152025
00.5202225sleeve 0.50 + 22 × 0.01
Spindleor drag the thimble up and down
Measure
Least count — 0.5 mm ÷ 500.01 mm
Sleeve0.50 mm
Thimble at datum22 × 0.01 = 0.22 mm
Observed0.72 mm
Zero error− 0.02 mm
Corrected0.70 mm
Trials

Take the reading a few times. One measurement is a number; several are a result.

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