Measuring slope of grain by electrical capacitance at moisture contents above fiber saturation

Recently, an electrical capacitance-type-device, called the slope-of-grain indicator, was found to be a suitable alternative to visual assessment of slope of grain in lumber. Early work reported that the device required no adjustment for moisture content (MC). The objective of this pilot study was to test lumber at MCs above and below the fiber saturation point (FSP) in an attempt to validate this claim. Results show that no adjustment is required only when MC is below FSP. Because measurement errors can be very large when the MC exceeds the FSP, electrical capacitance does not appear to be a suitable technique for assessing slope of grain in green lumber.

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