Foreword by the Editor
The Physikalisch-Technische Bundesanstalt is a player on the most diverse fronts: on the national, the European and the global front. This is only logical – seeing that metrology (PTB’s field of work) is of global concern. For a scientific journal such as the PTB-Mitteilungen, which focuses on topics of metrology, this inevitably calls for internationalization. Precisely this has been taken into account with this issue which has collected scientific papers as the findings of the European research project Traceable Dynamic Measurement of Mechanical Quantities. This project was funded by the EU within the framework of the European Metrology Research Programme (EMRP) and was launched in September 2011. Now, four years later, there is a full spectrum of findings which have been compiled here at one place for the first time.