Formal drawings are a more precise style of drawing. They can be produced by hand or with computer aided design (CAD) packages. Formal hand drawings use tools such as rulers and set squares to ensure ...
Scientific manuscripts are full of images. Since the birth of the life sciences, these images were in a form of hand drawings, with great examples from da Vinci, Hooke, van Leeuwenhoek, Remak, Buffon, ...
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