In 1851, in order to expand the business, Cassell purchased William Cathrell's printing plant in The Strand, London, bringing the printing of the ""Working Man's Friend"" in-house. In 1851, ""The Illustrated exhibitor"", a monthly periodical about The Great Exhibition, started publication, to great success, achieving sales of 100,000 by December. The expansion of the company meant a move to bigger premises at "La Belle Sauvage Yard" - previously the site of a centuries-old inn - on the north side of Ludgate Hill, in 1852. Around this time the ""Cassell's Library"" series started to appear; 26 volumes were eventually published including books on history, biography and science. In April 1852, the weekly ""Popular Educator"" started publication, achieving both popular success and critical acclaim - "a school, a library and a university" was how one commentator described it. The magazine inspired readers to continue their education in local classes, with Cassell offering practical and financial help where needed. It became something an institution, helping to improve the education, prospects and employment opportunities of the nation; even Lloyd George, future Prime Minister of Britain, credited the ""Popular Educator"" with bolstering his meagre childhood education and helping him to better himself. This was followed in 1852 with the ""Popular Biblical Educator"", which hoped to do for religion what its predecessor had done for general knowledge. In 1853, the ""Illustrated Family Paper"" started publication, aiming to provide literary recreation for a family audience. It included not just educational articles but serialisations of novels as well. One of these ""The Warp and the Weft"", a tale about Lancashire mill workers by John Frederick Smith, appeared during the Lancashire Cotton Famine, and inspired readers of the paper to contribute a large sum to a relief fund for cotton workers. In 1867, after Cassell's death, the magazine was reduced in size and changed its name to "Cassell's Magazine". By the end of 1854, an unexpected call to repay credit advanced by his paper supplier forced Cassell to sell the copyright and stock for the ""Illustrated Family Paper"", ""Popular Educator"" and other completed publications. This was only meant to be a temporary measure until the business found its feet again. Hence he found himself in semi-partnership with the printing firm "Petter & Galpin". During this interim period ""The Illustrated Family Bibl"e" a periodical in penny parts appeared and achieved popularity abroad as well as at home.