Samples of sewage containing sufficient potassium chromate to provide 1, 10 and 100 mgm. chromium per litre of sewage were treated in laboratory percolating filters, and comparisons were made with ...

DURING the study of a 17 per cent chromium–8 per cent nickel–4 per cent silicon–1 per cent niobium steel, the composition of which is shown in Table 1, a phase not previously reported was ...