contour drawing - shows outlines, shapes and edges but not fine detail, texture, tone or colour cross contour drawing - uses lines drawn across surfaces to suggest their depth and form tonal study ...

The best free Windows drawing apps have different features and target specific types of users ... there's no reason to pay when you can use these five free drawing apps for Windows.

However, very few of the nearly five dozen sets in NMAH's mathematics collections ... these cases can give us insights into the types of drawing instruments that were valued in engineering practice ...

contour drawing - shows outlines, shapes and edges but not fine detail, texture, tone or colour cross contour drawing - uses lines drawn across surfaces to suggest their depth and form tonal study ...