'constant line' is a perfectly acceptable phrase in written English.
It is used to describe a line that does not change, and can refer to a literary or figurative concept, such as in the phrase "The novel follows a constant line of thought".
The men's room had a constant line, too, despite six portable toilets outside.
Along a constant line of ky, the reflected electron motion is completely reversed in both x- and y-direction.
(This has been a constant line of attack for some days now, although Duncan Smith's tax credit claims did not survive the Channel 4 FactCheck treatment).
But a fortress requires a constant line of supply; those who take refuge in attics and cellars require the unceasing aid of confederates; prisoners need advocates, escape plans, or simply a window that gives onto the sky.
As shown in Fig. 2c, an incident electron with direction of motion pointing upwardly-right (red arrow) is reflected as an electron pointing downwardly-left (green arrow) along a constant line of ky.
The reports said he cannot be cared for in the Nauru immigration centre's Managed Accommodation Area, where he has been involuntarily committed under Nauruan law and where he remains on "constant line of site observations".
Tourists and neophytes have no real notice that half the width is set aside for bicyclists, leading to constant line-crossing and near accidents.
Novel control strategy for unbalanced load conditions is required to perform under the constraint of constant line-to-line voltages and uncontrollable load currents.
On Thursday, Mr. Ryan had set up his microphone and speakers in front of where the Times Square shuttles scoot in and out, and there were near constant lines of people heading in both directions.
"It will undermine many of the Democrats' constant lines of attack, because they won't have Al Gonzales to kick around any more," Mr. Bartlett said in a telephone interview.
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