Figure 1. To find the size of the replacement slate, multiply the exposure by two, and add 3 inches (7.6 cm) for the headlap. Then round up to 12, 14, or 16 inches (30, 36, 41 cm) - the standard sizes of slates.
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Figure 1. To find the size of the replacement slate, multiply the exposure by two, and add 3 inches (7.6 cm) for the headlap. Then round up to 12, 14, or 16 inches (30, 36, 41 cm) - the standard sizes of slates.