This authoritative reference covers 325 scientific instruments ranging from antiquity to the present, and from the mundane to the highly sophisticated. Entries explain how they work and trace their invention, development, distribution and use. Fully illustrated and complete with bibliographies, it will be particularly useful to students and scholars of modern science and technology. Reflecting contemporary practice, it examines instruments used for testing and monitoring, as well as those used for research, and even considers a number of widely used laboratory organisms (such as drosophila and e.coli) as instruments.