Two pages from The Textile Mercury, 13 June 1891, under the heading Machinery and Appliances. They describe the Warren Water Filter, an American gravity gravel-bed filter with a mechanical agitator for cleaning the bed, offered in London by Frederick Nell for bleachers, dyers, printers and boiler users. The pages also include installment XX of Papers on Bleaching (bleaching wool with hydrogen peroxide), notes on recent patents in bleaching, dyeing and printing (aniline black, ingrain colours, lithographic printing of fabrics, electrolytic bleach liquors), and the start of an article on finishing half-silk goods.