Knight's American mechanical dictionary : a description of tools, instruments, machines, processes and engineering, history of inventions, general technological vocabulary ; and digest of mechanical appliances in science and the arts . Psychrometers. a cotton-wi<?k leading to water in a glass below the wet air circulates freely around the wet bulb This is now theaccepted form of hygrometer, being more conTenient than the Fig. Psychrometers. Danieirs dew-point instiument. (See Hvorombti;b.) This isshown at h. It consists of a bunt tube with a globe at eachend, and is partly f
Knight's American mechanical dictionary : a description of tools, instruments, machines, processes and engineering, history of inventions, general technological vocabulary ; and digest of mechanical appliances in science and the arts . Psychrometers. a cotton-wi<?k leading to water in a glass below the wet air circulates freely around the wet bulb This is now theaccepted form of hygrometer, being more conTenient than the Fig. Psychrometers. Danieirs dew-point instiument. (See Hvorombti;b.) This isshown at h. It consists of a bunt tube with a globe at eachend, and is partly filled with ether, the reniaiudt-r of the spatewith vapor of ether, the air having been exjx-lled. One of thetubescnntains a thermometer whose bulb is in the liquid. Thestem has another thermometer as a means of comparison. Theupper globe being moistened externally with ether, evaporationtakes place, producing condensation of ether in the upper bulb,which causes evaporation from the ether in the lower fall of temperature in the iiiiuid. By watching theI lower globe, the exact point at which dew commences to fallmay be noticed, and the temperature of the inclosed thermome-ter is compared wiih that on the stem. The precise temperature at which this moisture begins toI form at the level of the surface of the ether is the drw-potnt,^ and the difference between the cfew-point temperature and theI natural temperature is the
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Keywords: ., bookcentury1800, booksubjectin, booksubjectmechanicalengineering
