While they were still nearly as large as rheostat dimmers, they were highly efficient devices and their dimming effect was independent of the load applied so it was far easier to design the lighting that would be attached to each autotransformer channel.
They were still nearly as large as rheostat dimmers. They were highly efficient devices was independent of the load. They were highly efficient their dimming effect was independent of the load. This load was applied. It was far easier to design the lighting. This lighting would be attached to each autotransformer channel.