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  2. Vernier scale - Wikipedia

    en.wikipedia.org/wiki/Vernier_scale

    Vernier caliper scales; main at top, vernier at bottom. It reads 3.58 ± 0.02 mm by adding 3.00 mm (left red mark) on the fixed main scale to vernier 0.58 mm (right red mark). The main scale reading is that to the left of the zero on the vernier scale. The vernier reading is found by locating the best aligned lines between the two scales.

  3. Philadelphia rod - Wikipedia

    en.wikipedia.org/wiki/Philadelphia_rod

    The rod may be equipped with a target to increase the readable range of the rod. When the target is equipped with a Vernier scale measurements to the thousandths of a foot are possible. For readings less than 7 ft the target is attached on the bottom section of the rod and adjust by signals from level operator until the target is inline with ...

  4. Calipers - Wikipedia

    en.wikipedia.org/wiki/Calipers

    The calipers in the diagram show a primary reading on the metric scale of about 2.475 cm (2.4 cm read from the main scale plus about 0.075 cm from the vernier scale). Calipers often have a "zero point error": meaning that the calipers do not read 0.000 cm when the jaws are closed.

  5. File:Practical lessons in English grammar and composition (IA ...

    en.wikipedia.org/wiki/File:Practical_lessons_in...

    Read; View on Commons; General ... Size of this JPG preview of this PDF file: 357 × 599 pixels. ... Practical lessons in English grammar and composition: Author ...

  6. Vernier acuity - Wikipedia

    en.wikipedia.org/wiki/Vernier_acuity

    Vernier acuity (from the term "vernier scale", named after astronomer Pierre Vernier) is a type of visual acuity – more precisely of hyperacuity – that measures the ability to discern a disalignment among two line segments or gratings. A subject's vernier (IPA: / ˈ v ɜːr n ɪər /) acuity is the smallest visible offset between the ...

  7. Pierre Vernier - Wikipedia

    en.wikipedia.org/wiki/Pierre_Vernier

    The main scale reading is the rightmost graduation that is to the left of the zero on the vernier scale. The vernier reading is found by locating the best aligned lines between the two scales. The 0.02 mm engraving indicates the caliper's accuracy and is the "Vernier constant" for this scale. He was born in Ornans, France, in 1580. He was ...

  8. Judge dumbfounded by error at site of 'suicide' where teacher ...

    www.aol.com/judge-dumbfounded-error-suicide...

    A judge told the parents of 27-year-old Ellen Greenberg, a Philadelphia teacher found dead with 20 stab wounds in 2011, that the city's declaration of suicide was "puzzling."

  9. Goniometer - Wikipedia

    en.wikipedia.org/wiki/Goniometer

    Since the spaces, both on the main scale and the Vernier scale, are numbered both to the right and the left from zero, any angle can be measured. The readings can be taken either to the right or to the left, according to the direction in which the zero on the main scale is moved.

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