Electron microscopy [EM] requires many specialized implements, such as these Better Equipment for Electron Microscopy Inc. [BEEM] Dial-a-Grid storage units. To study biological samples via EM, they are placed on a small copper grid made of very fine mesh; these boxes store and protect such grids, and are designed to expose only a single grid at a time, reducing the chances that other grids in the device will be damaged when removing one. This design was patented in 1967 by Stanley Brown, a BEEM employee.
These Dial-a-Grid storage units held grids used for the electron microscope in the sub-basement of Building 7. Dr. Albert Kapikian, NIAID, made extensive use of this microscope in his virology research. It was instrumental in his discovery of the Norwalk virus family, the first human gastroenteritis viruses ever isolated.