Metodi di analisi spettrografica quantitativa con spettrografo Hilger E 492

Using a quartz spectrograph of large dispersion, the only Hilger E 492 in Italy, routine analysis of steel was established by the spark method. After trying out cylindrical electrodes for some time, a change was made to flat surface sparking with a pure Al counter-electrode and this gave more reproducible results; the sparking conditions were also altered. By using a low-contrast plate and developer the linear portion of the calibration line was usefully extended.