Bible Encyclopedias
Vertical
1911 Encyclopedia Britannica
(from Lat. vertex, highest point), the direction of the line of action of gravity, as determined by the plumbline. The angle of the vertical is the angle between the direction of the plumb-line and that of the earth's centre (see Earth, Figure 01 ? The).
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Bibliography Information
Chisholm, Hugh, General Editor. Entry for 'Vertical'. 1911 Encyclopedia Britanica. https://www.studylight.org/encyclopedias/eng/bri/v/vertical.html. 1910.