plumb rule

The bores should be set as near true as possible, tested by a spirit-level rested on the bore and placed as near true as can be judged with the length of the bore, and a plumb rule may be applied to the end faces where the cover joint comes.

Plumb′-line, a line to which a mass of lead is attached to show the perpendicular: a plummet; Plumb′-rule, a narrow board with a plumb-line fastened to the top, used to determine a perpendicular.

The tools he uses are the rule, axe, adze, saws, mallet, hammers, chisels, gouges, augers, pincers, set squares, bevel, compasses, gauges, level, plumb rule, jack, trying and smoothing planes, rebate and moulding planes, and gimlets and wedges.

The W. Master, 1304, will then present the Trowel to the P.G.M., who will adjust the cement, and the upper stone will be lowered, with three distinct stops. p. 150The R.W. the P.G.M. will now prove the just position and form of the stone by the Plumb Rule, Level, and Square, which will be successively handed to him by the P.G.

The elusive beauty of this chaste, undecorated surface seems to me to be due to the fact that the wall was built under the eye of a master mason who knew not the straight edge, the plumb rule, or the square.