A crusher was used to crush a material with a compressive strength of 22.5 MN/m2. The size of the feed was minus 50 mm, plus 40 mm and the power required was 13.0 kW/(kg/s). The screen analysis of the product was:

\begin{tabular}{|c|c|} \hline Size of aperture (mm) & Amountofproduct(percent) \\ \hline through 6.0 & all \\ \hline on 4.0 & 26 \\ \hline on 2.0 & 18 \\ \hline on 0.75 & 23 \\ \hline on 0.5 & 8 \\ \hline on 0.25 & 17 \\ \hline on 0.125 & 3 \\ \hline through 0.125 & 5 \\ \hline \end{tabular} \begin{tabular}{|c|c|} \hline Size of aperture (mm) & Amountofproduct(percent) \\ \hline through 6.0 & all \\ \hline on 4.0 & 26 \\ \hline on 2.0 & 18 \\ \hline on 0.75 & 23 \\ \hline on 0.5 & 8 \\ \hline on 0.25 & 17 \\ \hline on 0.125 & 3 \\ \hline through 0.125 & 5 \\ \hline \end{tabular}