Darley C-811 3 bulb signal

This was Darley's most popular signal. It only had three bulbs. Each bulb shone in all four directions. Therefore one street had red on the top and green on the bottom while the cross street had to have green on the top and red on the bottom. Yellow displaued in all four directions and overlapped the red / green indications. A 3 circuit controller sits on the bottom plate.