"Barometer, n.: An ingenious instrument which indicates what kind of weather we are having"

The quote by Ambrose Bierce is referring to the barometer, an instrument used to measure atmospheric pressure. This pressure is used to predict the weather, as changes in pressure can indicate changes in the weather. The barometer is an ingenious instrument because it can accurately measure the atmospheric pressure and provide an indication of what kind of weather is coming. It is a useful tool for predicting the weather, as it can provide an indication of what kind of weather is likely to occur in the near future. The barometer is an invaluable tool for meteorologists and other weather-related professionals, as it can provide an accurate indication of the weather in a given area. It is also a useful tool for the general public, as it can provide an indication of what kind of weather to expect in the near future. The barometer is an ingenious instrument that has been used for centuries to accurately predict the weather.