Home weather stations include hygrometers, thermometers, barographs, and barometers. Such features include GPS, compass, barometers and altimeters. Typical applications include miniaturized weather stations, electronic barometers and altimeters. Measurement instruments like pressure gauges, altimeters and barometers include linkage-type function generators as linearization means. Convex menisci occur, for example, between mercury and glass in barometers and thermometers. A "siphon barometer" is the term sometimes applied to the simplest of mercury barometers. In 1717, Fahrenheit settled in The Hague as a glassblower, making barometers, altimeters, and thermometers. Even the transportation and packaging of mercury-containing thermometers and barometers is severely restricted. Siphon barometers are still produced as precision instruments. Stone housings for such barometers are still visible at many fishing harbours. Siphon barometers should not be confused with a siphon rain gauge. Such barometers are an enclosed column of mercury standing vertically with gradations on the tube. By 1647, Pascal had learned of Evangelista Torricelli's experimentation with barometers. Scientists at the time were familiar with small fluctuations in height that occurred in barometers. The polls used below are the historical Ifop-JDD and Sofres barometers.