Old pump room under the Hiram M. Chittenden Locks Administration Building, Seattle, Washington. This is part of what appears to be 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 general view in Chittenden Locks - old pump room under Administration Building 08.jpg and a front detail view in Chittenden Locks - old pump room under Administration Building 08.jpg.