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datum line
(redirected from reference line)

   Also found in: Encyclopedia 0.01 sec.
datum line - The horizontal or base line, from which the heights of points are reckoned or measured, as in the plan of a railway, etc.
See also related terms for measured.


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When turned on, the BowPlane emits a vertical reference line or sheet of laser light, 360 degrees around the inside perimeter of your bow--up and down the bowstring, along the cams and/or idler wheels, and then dissecting the upper and lower limbs, riser, grip, rest and sight.
Test line is same as or darker than reference line indicating that you may ovulate within 24 to 36 hours.
In the first step, Base Line (BL) and Supplementary Reference Line (SRL) are defined.
 
 
 
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