The Strauss heel trunnion bascule which formerly use by the Northern Pacific railroad was repaired in 1928 that the operating machinery was removed, built in the machinery inside the counterweight bridge tower, the strut was transferred from the bridge tower to the bascule truss to support the counterweight and notice the framework was change in place. The span is in the better suited operation.
This is the detail of the bridge with the operating machinery mounted on the counterweight bridge tower and struts pinned to the bascule truss
This first picture is a Northern Pacific railroad Strauss Heel trunnion bascule bridge constructed in 1911 of The Railway And Engineering Review showing the operation strut pinned to the counterweight bridge tower and the machinery on the bascule span.
The second two pictures of the same bridge of the Northern Pacific railroad bridge used now used by the Burlington Northern & Santa Fe railroad repaired between the late 1920's to the 1930's with the energy changed from the span to the counterweight and the operating machinery built into the counterweight bridge tower and the strut pinned to the bascule truss.
My Grandfather, Richard Bearden, was the operator of that very bridge from 1929 until he retired from the Northern Pacific Railroad in 1959. I remember spending the night with him there several times, amazed by the machinery and waiting for hours for a train to come so I could watch Grandpa make the bridge go down to let the trains cross.
Thanks Max much appreciated I do have some on the web (drawbridges photo stream) page but I'm not from Seattle. I would love to travel there and explore some bridge and take pictures in Seattle, I can send you some of my sketch drawings of them in Seattle trough my email above. You can type in Duwamish River bridges on google or yahoo and you might come across my drawings. Thanks again.
drawing of the bridge are wonderful.
do you show them anywhere in the Seattle region?