This expansion apparatus comprises two cast-iron uprights (18cm height) linked by two nickel-plated rods, supporting an expansion bar at the top. One end is fixed and the other rests on a friction pointer with a scale reading 0 to 90 degrees. The apparatus is supplied with one each of aluminum, brass, and iron expansion bars (38cm length) for comparative studies of linear thermal expansion. When heated, the expanding bar moves the friction pointer, providing a visual and quantitative measurement of thermal expansion. Suitable for physics classrooms.