Answer (1 of 5): The T-square is a strait edge and was used to draw horizontal lines only. Right-handed draftsmen would align the T-square with the left edge of the drawing board and use a mechanical pencil to draw. It’s the opposite for left-handed people. Two triangles were then needed to draw
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T-Squares MAU ART & DESIGN GLOSSARY|Musashino Art University
The city of Washington, DC looks like it should have been a square