Illustration showing the correct and incorrect position of a right line pen against a T-square, triangle,…

The construction of a star with square overlapping each other using a triangle and T square. This image…

A diagonal line pattern drawing exercise in for T square and triangle. The image is constructed by dividing…

An English T-square for drawing straight lines. The narrowing of the bottom blade makes the T-square…

A long fixed head T-square for drawing straight lines. The head shape of the T-square allows for drawing…

A regular fixed head T-square for drawing straight lines. The blade must be perfectly straight in order…

T—squares can be temporarily adjusted by putting the thumb tack in the head as illustrated. This…

A test to ensure the triangle is accurate by drawing a perpendicular line from a T-square.