 It was to eventually supplant Yorkshire's previous cottage industry of hand driven spindles.As the business continued to expand further mills, warehouses, engine houses, and reservoirs were added on the south side of Hol Beck.The six storey Mill 'C' was added in 1815–16, Mill 'D' followed in 1826–27, and Mill 'E' (which is aligned to the roadside and joined Mill 'C' to Mill 'D') in 1829–31.