Traditional drafting tools – parallel straightedge usage The parallel straightedge (or drafting machine straightedge) can be used both for aligning the drawing sheet on the board and for drawing accurate horizontal lines. Evaluate this statement.

Introduction / Context:
Before computer-aided design became prevalent, manual drafting relied on devices like the T-square and the parallel straightedge. Understanding their intended uses helps learners appreciate alignment, repeatability, and accuracy in traditional drafting techniques.

Given Data / Assumptions:

• A parallel straightedge is mounted to move parallel across the board (often on cables or rails).
• Paper must be squared to the device to ensure orthogonality of lines.
• Horizontal lines are drawn by sliding and using the straightedge as a guide.

Concept / Approach:
When the sheet's edges are aligned with the straightedge, all subsequent horizontal constructions reference the same datum, ensuring consistency. The device doubles as an alignment reference (squaring the sheet) and as a drawing guide for horizontals, similar to a T-square but with improved stability and convenience.

Step-by-Step Solution:

Verification / Alternative check:
Drafting manuals describe parallel straightedges as alignment aids and as primary tools for horizontal guidelines, title blocks, and baselines.

Why Other Options Are Wrong:
Marking it “Incorrect” would ignore the tool’s dual purpose documented in traditional practice.

Common Pitfalls:
Not securing the sheet, causing slight skew; assuming the device is self-calibrating without occasionally checking for parallelism across the board.

Final Answer:
Correct