In the month of November following, Watt forwarded to Roebuck the detailed drawings of a covered cylinder and piston to be cast at the Carron Works. Though the cylinder was the best that could be made there, it was very ill-bored, and was eventually laid aside as useless. The piston-rod was made at Glasgow, under Watt’s own supervision; and when it was completed he was afraid to send it on a common cart, lest the workpeople should see it, which would “occasion speculation.” “I believe,” he wrote in July, 1766, “it would be best to send it in a box.” These precautions would seem to have been dictated, in some measure, by fear of piracy; and it is obvious that the necessity of acting by stealth increased the difficulty of getting the various parts of the proposed engine constructed. Watt’s greatest obstacle continued to be the clumsiness and inexpertness of his mechanics. “My principal hinderance in erecting engines,” he wrote to Roebuck, “is always the smith-work.” In the mean time it was necessary for Watt to attend to the maintenance of his family. He found that the steam-engine experiments brought nothing in, while they were a constant source of expense. Besides, they diverted him from his retail business, which needed constant attention. It ought also to be mentioned that his partner having lately died, the business had been somewhat neglected and had consequently fallen off. At length he determined to give it up altogether, and begin the business of a surveyor. He accordingly removed from the shop in Buchanan’s Land to an office on the east side of King-street, a little south of Prince’s-street. It would appear that he succeeded in obtaining a fair share of business in his new vocation. He already possessed a sufficient knowledge of surveying from the study of the instruments which it had been his business to make; and application and industry did the rest. His first jobs were in surveying lands, defining boundaries, and surveyor’s work of the ordinary sort; from which he gradually proceeded to surveys of a more important character.