Mason's Wet and Dry Bulb Thermometer Subcategory_Bases and Rods 10-inch vacuum pump plate on

10-inch vacuum pump plate on an aluminum base with a stopcock and rubber seal

Used to map the magnetic field around a circular current loop

Demonstration electrophorus with a 9cm aluminum disc

this small anemometer measures wind speed during earth-science fieldwork and classroom weather investigations

Five-ohm reference coil non-inductively wound from double silk-covered constantan inside a transparent tube

Mason's Wet and Dry Bulb Thermometer Subcategory_Bases and Rods 10-inch vacuum pump plate onPaired dry bulb and wet bulb thermometers on this Mason's hygrometer, calculating relative humidity from the temperature difference between the two readings for meteorology coursework.