sion. to easily managed boats; the engines shall be en- no relief valves. In some cases, where the valves In various other details of our locomotive shops a tirely under the control of the engineer, and can be removed have approximated in size to barn doors, great many changes and improvements have… … DA VIS'S PISTON VAIVE. loss of time necessary to shut off, or throttle the getting out of place. The cheeks or follow- We alluded to the superintendent, Mr. Thomas S. steam. ers are held together by the shoulder upon the valve Davis, previously, and we here append illustrations of The great…
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