River City Clocks Sun and North Wind Weatherball Water Barometer - 8 Inches Tall - Model # 910-100 Quickly indicates any variations in atmospheric pressure Air trapped by the liquid maintains a steady pressure High pressure or good weather pushes liquid down the spout Low pressure or bad weather causes the liquid in the spout to rise Dimensions: 7-1/2-inch by 4-1/2-inch; ball diameter 4-inch