The Artizan . in 1850, by the PrussianGovernment, for the invention of the Manometer, or Pressure and , which I am about to describe to you, and which has become so greata success, as may be judged by the fact that, since the 23rd of January, 1850,when those letters patent were granted, upwards of 60,000 gauges of that con-struction have been sold. The well-known difficulty to obtain letters patentfrom the Government of Prussia, which ia particularly illustrated by therefusal of such forGiffards Injector, gives some reason to believe that Schaeffersinvention was entirely new and wi
The Artizan . in 1850, by the PrussianGovernment, for the invention of the Manometer, or Pressure and , which I am about to describe to you, and which has become so greata success, as may be judged by the fact that, since the 23rd of January, 1850,when those letters patent were granted, upwards of 60,000 gauges of that con-struction have been sold. The well-known difficulty to obtain letters patentfrom the Government of Prussia, which ia particularly illustrated by therefusal of such forGiffards Injector, gives some reason to believe that Schaeffersinvention was entirely new and without precedent, when it is remembered thatin Prussia the decisions arrived at in applications for letters patent dependentirely upon this point—whether the presumed invention is entirely new, orwhether anything similar to it has been made before. The following is the description of these gauges, whose construction, however,is so simple, that it explains itself fully by reference to the illustrations. Their. action is direct. The steam or other fluid which is brought by a tube from theboiler or other vessel, exerts its pressure on a corrugated steel plate, a a, whichis protected from corrosion by a sheet of pure silver, k. The plate is thus de-flected upwards, and when the pressure is removed, it returns to its originalposition; it will thus be perceived that the accuracy of the gauge dependsalmost entirely upon the perfect elasticity of this steel plate. A small blockprovided with a socket-joint is fixed to the joint, and its motion is transferred tothe quadrant, d, by means of the connecting pieces, 6 and c; this quadrantcommunicates the motion finally to the index by gearing into a small pinion,fixed upon the axle or pivot which carries the index, and the gearing is so pro-portioned as to multiply that motion sufficiently to render the divisions of thedial clear and legible. The spiral or hair spring, e, regulates the motion of the index, and makes itcontinuous and steady.
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Keywords: ., bookcentury1800, bookdecade1840, booksubje, booksubjecttechnology
