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.
The principal line of the company has also been changed to renting/leasing of company's fixed assets as approved by Shareholders in AGM dated 30 October 2017.
Completing the principal line up will be one of Birmingham Hippodrome's favourite dames, Andrew Ryan as Nurse Nelly.
"As with any investigation, we will be led by the evidence, but at this stage, our principal line of inquiry is that the devices were sent by a violent dissident republican group.
"As with any investigation, we will be led by the evidence, but at this stage, our principal line of enquiry is that the devices were sent by a violent dissident republican group.
Anyone in the family can start roaming and it could be initiated by the principal line or one of its supplementary users.
BMG's VR and IDR take into account the bank's good liquidity and funding strengths and also the recent growth of its principal line of business, the payroll-backed credit card segment, which now accounts for over 72% of the total credit portfolio.
The company has ideally reflected its principal line of business in textile finishing sector and brought many innovations in dyehouse and laboratory automation.
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.
A simple one page memorandum having principal line of business and prohibitory clauses shall be introduced.
Imation's (NYSE: IMN) principal line of business is global data storage and information security.
To calculate the attribute values for the fuzzy inference systems, we detect the principal line and the arrowhead (or the auxiliary lines) for the sequence Q as follows.

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