We had lightning rods on the old barn at home, they were taken off when a new roof was put on in 1979. It seemed a shame to put holes in the new roof to re-install them, Grandpa said the barn has been hit by lightning both with them on and before they were on, so they were not put back. Another new roof was put on in 1998, steel this time, and barn has been hit again since them. Fortunately never any fires, just some split boards and shorted wiring.
Just a question--the old glass balls on the vintage rods, I was under the impression that their original purpose was to shatter when lightning struck, that way you can tell that you had a lightning strike. Is that right?
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Today's Featured Article - Engine Valves - Some Helpful Information - by Staff. Intake - On the intake stroke the piston moves doward, sucking in carburized fuel through the open intake valve. Exhaust valve is closed. Compression - With both the intake and exhaust valves closed, the pistons upward stroke compresses or squeezes the fuel into the combustion chamber. Firing - Ignited by the spark, the compressed fuel explodes and forces the piston downward on its power stroke. Intake and exhaust valves are closed. Exhaust valves and seats are exp
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