The business continued to expand and in the year 1832 a large factory at Great Horton was taken over in which, for some considerable time, the main portion of the spinning business was conducted. Three year later (1835) John Foster erected a mill at Black Dyke, Queensbury, the site of a farmstead owned by his wife’s family.
Although difficulties were encountered during the period of transition between the hand-loom and the power-loom, John Foster clung tenaciously to his ideas and ideals. Power-looms were introduced in 1836. The mill had between 3,000 and 4,000 spindles turning out yarn at the rate of about 5,000 lbs. per week, “ … a quantity which, at that day and in that locality, was looked upon as something prodigious”.