What does «barómetros aneroides» mean in Spanish?
- These are barometers that do not contain any liquid, also called metal barometers. Although less accurate than good mercury barometers, aneroids are convenient because of their small size and ease of transport. They have wide use in ships, aircraft, and laboratories as such barometers; they are also employed by geologists, motorists, climbers, and others as barometers and altimeters for approximate determination of altitude. The pressure-sensitive part of an aneroid barometer consists of a thin cylindrical chamber constructed of metal and hermetically sealed after a vacuum has been built into it. The circular bases of the chamber are flexible diaphragms of thin, corrugated metal, the walls of which are held apart by a spring that counteracts the effects of atmospheric pressure. Pressure changes cause movements of the diaphragm and the attached spring. These movements, amplified by a system of levers, are transmitted to a stylus moving on a graduated dial. The scale indicates the barometric pressures in inches or millimeters as in the mercury ones. All the readings of an aneroid barometer must first be checked and periodically compared with those of an ordinary barometer.