Meanwhile, following his sale of his share in the original foundry in 1792, William Caslon III had purchased (in the same year) the Salisbury Square foundry from the estate of the recently deceased Joseph Jackson, and renamed it W. Caslon & Son. In 1807, W. Caslon & Son was passed to William Caslon IV. In 1819, William IV sold the business to the new Sheffield foundry of Blake, Garnett & Co. In 1837, the Salisbury Square Caslon Foundry became the property of Stephenson, Blake & Co.