We cut the bead off the old pin and tried a hydraulic jack on it, but it would not start. We then drilled five or six 1″ holes in the shank and the pin came out easily. The hole was then calipered and found to require considerable dressing. The crank shaft was then tried for level and found by turning in various positions and by using a very sensitive level, to deflect from the horizontal approximately ¹⁄₂ of 1000th of an inch per foot in length. The hole was then enlarged by use of file and scraper, its adjustment being proven as the work progressed by frequent trials of level placed within the hole, at various points in the revolution of the shaft. Finally, the trial plug was worked into the hole and used as a surface plate, the “high” spots being scraped down and the plug found to line with the shaft and the hole by caliper, found to be approximately ³⁄₁₀₀₀″ smaller than the shank of the pin. The pin was then forced in and found to stand nearly true. The small untruth was easily corrected in riveting up the back and the pin was thrown approximately ²⁄₁₀₀₀″ away from the center line of shaft rotation to offset the deflection that would be occasioned when running by the impact of the steam admission on centers. I think it quite likely that the pin during the twenty-four years’ service up to the present date has worn scarcely a measurable amount. Very truly, E. F. WILLIAMS. P. S. I saw the engine about 15 years ago and it was running very smoothly. Some time after I had left, the company found that they needed a descriptive and illustrated catalogue of the engine, and they had no one to write it; so they came to me, and in my office in New York I prepared one for them, for which they gave me the credit by printing on the title-page and cover the line, “By Charles T. Porter.” I took the same pains with this that I should have done had I owned the whole place. The following letter, referring to an engine made by me in Newark, was sent by the addressee to the Southwark Foundry with an order while I was engaged on their catalogue. They made a blue-print of it and sent it to me for insertion. YOUNGSTOWN, O., Dec. 21st, 1882 MR. F. L. WATERS-- _Mankato Minn._ _Dear Sir_-- _Your favor recd, making enquiry how we like the Porter Allen Engine: would say, we have now run it four years, it has never failed one minute or cost one cent for repairs nor varied a revolution from its speed, are using it now non-condensing but think of using a condenser before long. As we use it in connection with our water power, which is variable, sometimes too high and sometimes too low, making up the deficiency with the Engine, be it all or little, we do not know just how much coal we require for a Barrel in case we had no water, this much I think I know. That it is the finest Engine made, Simple, durable, and Economical, and always ready for effective duty._