THE WEATHER PROPHETS.
Suspend a small circular plate by its centre of gravity, by a fine string or piece of catgut, and attach the other end to a hook. As the air is more or less moist, the plate will turn. A bell-glass may cover it to prevent the wind deranging it, but the air must have access to the string.
Make a box, representing with one side a housefront with two doors, and mount on one side of the turning-plate a man with an umbrella, and on the other a lady with a fan. When the man comes out it indicates damp, whilst the appearance of the lady foretels dry weather. Unfortunately, as the atmospherical changes affect it but by degrees, these weather prophets are unreliable.