Illinois Railway Museum Blog

Can you perhaps explain to us folks not in the power line construction area what a class 4 pole is?

#1 c kronenwetter on 2013-01-08 22:57

What is a class 4 pole? A very good question. The strength of wood poles is determined by the length and diameter. The industry established standard critera to rate the strength. Since trees don't grow perfectly round, circumfrence is used instead of diameter. Class refers to the circumfrence range for a given strength. Class 1 is a fat pole. Class 10 is a very skinny pole. A class 4 pole is about 7" in diameter at the top.

#2 Max Tyms on 2013-01-09 12:10

The oldest Johnney balls were a porcelain ball with grooves formed in them for the wires. Why the name Johnney ball? I don't know. Check out glassian.org/GuyStrain/index.html

#3.1 M Tyms on 2013-01-12 11:38

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