This very old single blade switch (looks like iron) was mounted on these M-3740 Thomas multiparts at the old Pacific Power & Light Co. substation in Pasco, WA. I wish that I could have grabbed it back in 1980 when I took this photo, but it was an energized lead to a current transformer. Too bad, because it is now gone. The whole substation was re-modeled in recent years and this switch is nowhere to be found. The M-3740 multiparts are now high on collector's dream lists, mine included!