principal line

principal line

[′prin·sə·pəl ′līn]
(graphic arts)
The trace of the principal plane upon a photograph.
(spectroscopy)
That spectral line which is most easily excited or observed.

principal line

principal lineclick for a larger image
The line of intersection of the principal plane with the plane of the photograph. It is the trace of the principal plane upon a photograph (e.g., the line through the principal point and the nadir point).
References in classic literature ?
This is one of the principal lines of road in Brazil; yet it was in so bad a state that no wheeled vehicle, excepting the clumsy bullock-wagon, could pass along.
Its focus was to ensure that the companies registered with it having real estate as their principal line of business, operate under certain rules and regulations in order that they gain confidence of the public, it added.
If global financial conditions tighten further and capital flow pressures emerge again, flexible currencies should be the principal line of defence, Anoop Singh added.
The draft prescribes basic regulatory requirements for the MRC's principal line of business of refinancing credits to borrowers for the security of residential mortgage assets and other qualified collaterals.
These billets were coded unless they could not be reasonably aligned to a principal line of operation or complementary billet.
2 : a principal line, tube, or pipe of a utility system <water main> <gas main>
The principal line of Namsun 25-hp to 40-hp machines include three-axis vertical-spindle MCs and five-axis gantry and table-type portal designs.
Its principal line, "The Crossroads Collection," consists of more than 200 mouldings imported from Brazil, Taiwan and China.
3 m, similarly set back from the principal line of the facade.
Its principal line, "The Crossroads Collection," consists of more than 150 mouldings imported from Brazil, Taiwan and China.

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