Instruments
Many instruments have been invented to measure pressure, with different advantages and disadvantages. Pressure range, sensitivity, dynamic response and cost all vary by several orders of magnitude from one instrument design to the next. The oldest type is the liquid column (a vertical tube filled with mercury) manometer invented by Evangelista Torricelli in 1643. The U-Tube was invented by Christian Huygens in 1661.
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Famous quotes containing the word instruments:
“Water, earth, air, fire, and the other parts of this structure of mine are no more instruments of your life than instruments of your death. Why do you fear your last day? It contributes no more to your death than each of the others. The last step does not cause the fatigue, but reveals it. All days travel toward death, the last one reaches it.”
—Michel de Montaigne (1533–1592)
“The worth of a State, in the long run, is the worth of the individuals composing it ... a State which dwarfs its men, in order that they may be more docile instruments in its hands even for beneficial purposes—will find that with small men no great thing can really be accomplished.”
—John Stuart Mill (1806–1873)
“Fashionable women regard themselves, and are regarded by men, as pretty toys or as mere instruments of pleasure; and the vacuity of mind, the heartlessness, the frivolity which is the necessary result of this false and debasing estimate of women, can only be fully understood by those who have mingled in the folly and wickedness of fashionable life ...”
—Sarah M. Grimke (1792–1873)