April showers Proteus aerological instrument anemograph anemometer anemometrograph anemoscope aneroid barometer aneroidograph barograph barometer barometrograph chameleon cloud shapes cock feeler glass hurricane-hunter aircraft hygrometer kaleidoscope mercury moon pilot balloon probe quicksilver radiosonde random sample recording barometer rolling stone sample shifting sands sound sounder straw vote the weather trial balloon vacuometer vane water weather balloon weather instrument weather satellite weathercock weatherglass wheel of fortune whirligig wind cone wind indicator wind sock wind vane wind-speed indicator