Note 47 — PART XII. MATHEMATICS.
Reading edition
When the board is tapering, add the breadths at the two ends together, and take half the sum for the mean breadth. Or else, take the mean breadth in the middle.
Reading edition
When the board is tapering, add the breadths at the two ends together, and take half the sum for the mean breadth. Or else, take the mean breadth in the middle.