A plumb line is a line perpendicular to the horizon, hanging (through the air).
It will be just like 'Specs,' if it is a still night, to drop a plumb line and check himself.
One boy stands at Y and another at X, each with a plumb line.
The corpse no longer stirred; the chain was as motionless as a plumb line.
The mirror is always at hand, and a paper protractor on a piece ...