THE development of high-speed mechanical engines and similar devices has, during the last decade, brought forth a demand for both recording vibration amplitudes with accuracy and the analysis of such ...

RedShark Replay: One from the archives. Gone are the days when a light meter and a trained eye was enough; to do better, we need technological measures and test & measurement equipment. Traditionally, ...

IN all smooth wave-guides and many loaded wave-guides the phase velocity has the same sign as the energy velocity. Some systems having complex forms of loading have in the past been attributed with ...