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 - The Ferguson System Principal An implement cutting through the soil at a certain depth say eight inches requires a certain force or draft to pull it. Obviously that draft will increase if the implement runs deeper than eight inches, and decrease if it runs shallower. Why not use that draft fact to control the depth of work automatically? The draft forces are
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