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UNIT 5 LINEAR MEASURING DEVICES AND Linear …

55 LINEAR MEASURING DEVICES and Comparators UNIT 5 LINEAR MEASURING DEVICES AND COMPARATORS Structure Introduction Objectives Non-precision MEASURING Instruments Precision MEASURING Instruments Electrical MEASURING DEVICES Comparators Summary Key Words Answers to SAQs INTRODUCTION LINEAR measurement includes the measurement of lengths, diameters, heights and thickness. The basic principle of LINEAR measurement (mechanical type) is that of comparison with standard dimensions on a suitably engraved instrument or device. LINEAR MEASURING instruments are categorized depending upon their accuracy. The two categories are non-precision instruments and precision instruments. Non-precision instruments include steel rule, caliper divider, and telescopic gauge that are used to measure to the line graduations of a rule. Precision instruments include micrometers, vernier calipers, height gauges and slip gauges.

Linear measuring instruments are categorized depending upon their accuracy. The two categories are non-precision instruments and precision instruments. Non-precision ... The head forms a convenient marker in places where the rule must be held in a distance from the point being measured. Figure 5.9 : Depth Gauge . 60

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