About 1826 an even more dangerous lead process was introduced by Henry Daniel, who began in that year to make stoneware “china” in Shelton. This was the process of “ground laying” and “colour dusting,” in which the enamel paints are dusted in a dry state over a sticky oily surface to which they adhere. The leaded particles of paint dust are easily breathed into the lungs and caused a heavy mortality. The ærograph, invented in 1890, which lays the ground mechanically, reduced the risks of this process, and more recently the Home Office regulations regarding ventilation, mufflers, etc., have helped in the same direction. Among the Tunstall potters on the list of 1818 occur the names of Benjamin Adams and Jesse Breeze. Benjamin Adams was the son and successor of that William Adams who made jasper at Greengates and died in 1805. Within a year or two of 1818 he had to sell his factory, which was bought by John Meir, another Tunstall potter.[175] John Breeze had bought the house and factory built by Theophilus Smith in 1793 and called Smithfield. Smith had, in 1800, committed suicide in prison after failing three times to murder his wife’s lover.[176] His tragic end caused the name of his house to be changed to Greenfield; and in 1827 Jesse, son of this John Breeze of Greenfield, having no sons, married one of his daughters to William Adams, son of the successful potter of Stoke, and bequeathed his factory to him. In this way another branch of the Adams family returned to Tunstall. From 1827 to the present day the Adams family from father to son have continued to make earthenware at Greenfield. They have recently bought up Greengates also, and joined the two old Adams’ factories together. The firm has had a somewhat chequered career, but under the management of the present brothers and partners, William and Percy W. L. Adams, it has resumed its high reputation as one of the largest exporters of useful and ornamental ware.