Pierre Vernier

Vernier caliper scales; main at top, vernier at bottom. It reads 3.58 mm ± 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 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. Pierre Vernier (; 19 August 1580 at Ornans, Franche-Comté (at that time ruled by the Spanish Habsburgs, now part of France) – 14 September 1637, same location) was a French mathematician and instrument inventor. He was the inventor and eponym of the vernier scale used in measuring devices. Provided by Wikipedia
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    Vulnerabilidades y desigual proceso de reconstrucción después del sismo de Pisco del 15 de agosto de 2007 en la provincia de Chincha, Perú
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