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...work as well as long production runs. Computer controlled programmes used for prototype work are easily adapted for production runs. Frequently used for cutting electrodes for EDM. Machines with control of up to five axes are available with integral units for producing the “starter or threader hole” which is often required. Currents 1–32 A; voltages 55–60 V;...

...works, or proposing a new universal phonetic alphabet, Young was experimenting with the diffraction of light by narrow apertures and the interference of light due to reflection by thin films. His observations of coloured fringes in these experiments demonstrated that light must travel from place to place in the form of a wave, and the different colours comprising white...

...work out what’s inside the sun – you can’t send a probe inside to fly about. The trick is to use seismology in a similar way that earthquakes are monitored. It’s possible to work out what’s inside the Earth under our feet, right to the core, without digging, by measuring how “seismic waves” (vibrations from earthquakes) pass through the Earth. We know from...