John Rylands manufacturers, and about the same time they erected a new spinning mill. The Ainsworth mills, near Bolton, and other factories were subsequently acquired. Joseph and Richard retired around 1839 and the death of their father in July 1847 made John Rylands sole proprietor. The business continued to expand and in 1849 a warehouse was opened in Wood Street, London. A great fire occurred at the Manchester warehouse in 1854 but the loss, although very large, was speedily repaired. By 1864 the warehouses were seven storeys high and extended all the way along New High Street (now High Street) in Manchester:
John Rylands Library prevent the air being 'fouled by the opening of the outer doors' with internal swing doors between the circulation areas and the main library to 'preserve the valuable books from injury'. By 1900 the ventilation system had evolved to include electric fans to draw in air at pavement level through coke screens sprayed with water. On opening in 1900, the library had 70,000 books and fewer than 100 manuscripts and by 2012, more than 250,000 printed volumes and over one million manuscripts and archival items. The main foundation of the library's collections acquired in 1892 was the "Althorp Library" of