Every picture tells a story, but in this case, every story tells a picture — dozens of pictures, in fact, which, when viewed together, tell a story of innovation and technology. Meet the Perpetual ...

Pen and wash drawings on vellum, highlighted with touches of white, mounted on 18th century heavy paper, probably by Bachot. Possibily drawn for Ramelli's Le diverse figure et artificiose machine ...

An earlier version of this gallery appeared as the article "8 Common Drawing Mistakes to Avoid," originally published March 25, 2015. Many engineers still make and use engineering drawings. Here is ...