We teach basic light microscopy to our undergraduates in the first year, in classes of up to 30 people. Although we maintain good staff-student ratios during these classes, and rarely have any breakages, we felt in necessary to have some good quality, clear diagrams of our transmitted-light microscopes so students could follow along and refer to parts of the microscope. They also serve as a reference for our second and third-year students who are undertaking lab work that isn’t directly supervised. The design below is based on the microscopes we own from Brunel Microscopes (UK) Ltd., but are pretty generic. Please feel free to use these under the Creative Commons licence.