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What is the term for a line with an arrow on each end in an isometric drawing?

Dimension Line

In isometric drawings, the term for a line with an arrow on each end is actually associated with dimensions, which makes "Dimension Line" the correct term. Dimension lines are used to indicate the measurements of objects and are essential for conveying the size and scale in technical drawings. The arrows specify the starting and ending points of the measurement.

In contrast, center lines are typically used to denote the center of circles or symmetrical objects but do not have arrows at both ends. Extension lines extend from the object to the dimension line, helping to clarify what is being measured. Construction lines are often used as guide lines during the drafting process but do not have the designated arrows for measurements. Understanding these distinctions helps in interpreting technical drawings accurately, which is crucial in the field of boiler operation and maintenance.

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Center Line

Extension Line

Construction Line

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