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The angle of inclination relative to the horizontal of the petiole, lamina and drip tip of each leaf was measured using a transparent plastic protractor and a plumb line.
It involved the use of a bar with a plumb line, attached to a wooden handle.
It is derived by deducting normal heights from the normal plumb line.
A section of the scaffolding would hold a plumb line that was centered over a datum mark on the floor.
Apparently if a plumb line is dropped from the north side of the tower it would fall 3 feet away from the building.
It even gave instructions on how to obtain measurements using the plumb line.
The outer casing of the gyrocompass device is held in such a way that it remains aligned with the local plumb line.
A plumb line dropped from the tower revealed that the concrete block had settled during the storm, giving the lighthouse a pronounced shoreward list.
Each cross piece had a plumb line hanging vertically at each end.
The astrologer's instruments ("horologium" and "palm") are a plumb line and sighting instrument.
As the building proceeded upwards the plumb line would also be taken higher, still centered on the datum.
It was furnished with a plumb line and a double chord for making angular measurements and bore a perforated pointer.
There were instances of bricks, plumb lines and so on being thrown from bridges, and of tankers being forced on to the hard shoulder.
The force of gravity acts everywhere perpendicular to the geoid, meaning that plumb lines point perpendicular and water levels parallel to the geoid.
If the notches corresponding to the plumb lines matched on both sides, it showed that the beam was level.
