Shown is a vintage Westinghouse Round Type Integrating Wattmeter. Interior of meter looks a little distorted because the glass is very thick and uneven on the inside surface. This meter is in pretty good shape for it's age. The load wheel spins freely and all register gears seem to be in good condition. I'm kind of leary about wiring it up to see if it operates. I'll use a variac to slowly apply voltage to the potential coils.