Sound decibels are measured on a logarithmic scale, it's not linear. Other common logarithmic scales are: the pH scale for measuring acidity and alkalinity, and the Richter scale for measuring earthquakes.
Doubling the noise (sound energy) increases the number of decibels by three. If one generator makes 57 decibels, then two generators will make 60 decibels. Doubling that 2 x 2 = 4 generators would make 63 decibels. Doubling that 2 x 4 = 8 generators would make 66 decibels. Doubling that 2 x 8 = 16 generators would make 69 decibels, etc.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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