The turf is taken off either with the breast plough - a paring tool pushed forward from the breast or thighs by the workman - or with specially constructed paring ploughs or shims. The depth of the sod removed should not be too thick or burning is difficult and too much humus is destroyed unnecessarily, nor should it be too thin or the roots of the herbage are not effectually destroyed.
It is notorious among engineers that retaining walls designed in accordance with the well-known theory of conjugate pressures in earth are unnecessarily strong, and this arises mainly from the assumption that the earth is merely a loose granular mass without any such adhesion.
"That makes sense," Cynthia said, reaching back and unnecessarily holding on to the old man's belt.
Somewhat unnecessarily the prime minister went on to condemn the clergymen of the Church of England who had subscribed the Thirty-nine Articles, who have been the most forward in leading their own flocks, step by step, to the very, edge of the precipice.