I was working at Ingersol Milling (service call) in Roacford, Ill., they were aligning a rail very very long. They did it with a wire pulled very tight with weights attached to the ends and the weights hanging in oil to keep them from swinging. I remember they were looking at the wire with a very strong magnification. The object was to make the wire appear to be lined up in the eye piece. A tight piece of wire is within everyones budget. Now the piece to look at the wire might be another story....
As I remember, their wire was about 60 feet long.
Regards Walt. |