Here's a pic of a McGraw Edison Unistyle fixture. These fixtures are pretty rare here, I only know of a few places that has these and the smaller Unistyle 175 still installed.
This one would be the McGraw Edison Unstyle one.....due to the newer design....they stopped making them when they started making Unidors....Line Materials stuff ended in 1965-1966...so this above would be 1966-1970 design
Thanks Darren, I used to think that the Unistyle 400s were never used here for roadway lighting here in Ontario before but I've found a couple of these still in use here.
I guess this one was originally MV but was retrofitted with a HPS ballast and lamp during the changeover from MV to HPS.
I guess this one was originally MV but was retrofitted with a HPS ballast and lamp during the changeover from MV to HPS.