Old pump room under the Hiram M. Chittenden Locks Administration Building, Seattle, Washington. I'm pretty sure the array at left is a high-power resistor bank as a dummy load so that the shift isn't too sudden when power to the pump is turned on and off. You can see a front detail view in Chittenden Locks - old pump room under Administration Building 08.jpg and a 1/4 view in Chittenden Locks - old pump room under Administration Building 10.jpg.