Diagrams, optical instrument by unknown artist Diagrams, figures 1-4, showing an optical box or microscope to see things bigger or smaller. The box can be opened and the object placed on a plate. The box contains a lens, a microscope or magnifying glass, and has an opening for the light source to enter (e.g. the sun or a candle). The diagrams are accompanied by an explanation of the figures. Subject: Engineering / Optics [17th century]