And, after all, the fault was largely mine. I did not think of it till long afterwards, and it did not occur to anybody else, not even to those most deeply interested in the boiler. My surface condenser was the cause of all the trouble, and that was why I have to this day deeply regretted having put it in. The oil used in the cylinder was all sent into the boilers, and accumulated there. It saponified and formed a foam which filled the whole boiler and caused the water to be worked over with the steam as fast as it could be fed in. I have always wondered why the engine, being vertical, should not have exhibited any sign of the water working through it at the upper end of the cylinder. The explanation after all appears simple. The water on entering the steam chest mostly fell to the bottom and little passed through the upper ports. The trouble from oil was not felt at all in the Lancashire boiler. This, I suppose, was due to three causes. The latter held a far greater body of water, had a much larger extent of evaporating surface, and far greater steam capacity. I was always sorry that I did not give the Harrison boiler the better chance it would have had with a jet condenser. In this pair of diagrams, which are copied from the catalogue of Ormerod, Grierson & Co., the low steam pressure, 29 pounds above the atmosphere, will be observed. This was about the pressure commonly carried. The pressure in the exhibition boilers, 75 pounds, was exhibited by Mr. John Hick, of Bolton, as a marked advance on the existing practice. In preparing for the governor manufacture I had my first revelation of the utter emptiness of the Whitworth Works. Iron gear patterns were required, duplicates of those which had been cut for me at home by Mr. Pratt. The blanks for these gears were turned as soon as possible after I reached Manchester, and sent to the Whitworth Works to be cut. It seemed as though we should never get them. Finally, after repeated urging, the patterns came. I was sent for to come into the shop and see them. They were in the hands of the best fitter we had, who, by the way, was a Swedenborgian preacher and preached every Sunday. The foreman told me he had given them to this man to see if it was possible to do anything with them, and he thought I ought to see them before he set about it. I could hardly believe my eyes. There was no truth about them. The spaces and the teeth differed so much that the same tooth would be too small for some spaces and could not be wedged into others; some would be too thick or too thin at one end. They were all alike bad, and presented all kinds of badness. It was finally concluded to make the best of them, and this careful man worked on them more than two days to make them passable.