. Locomotive engineering : a practical journal of railway motive power and rolling stock . receive the screw, as shownill the sectional view. The thread on the ends of the screw atA \s I/i inch diameter, and that at B is iinch diameter, while the end C is ^ inchdiameter. The two ends are threaded thesame pitch, but are made half the pitch ofthe central part B through the rod. By avoids all reference to lap. Lead, on thecontrary, is very fully treated. At the time stated, lap began to makeits appearance, but to a very slight ex-tent, showing that its development wasto be on tentative lines rath
. Locomotive engineering : a practical journal of railway motive power and rolling stock . receive the screw, as shownill the sectional view. The thread on the ends of the screw atA \s I/i inch diameter, and that at B is iinch diameter, while the end C is ^ inchdiameter. The two ends are threaded thesame pitch, but are made half the pitch ofthe central part B through the rod. By avoids all reference to lap. Lead, on thecontrary, is very fully treated. At the time stated, lap began to makeits appearance, but to a very slight ex-tent, showing that its development wasto be on tentative lines rather than inobedience to any worked-out theories inadvance of trial, for the Camden & Am-boy Railroad then had all of its enginesrunning with i-i6 inch outside lap. Asif to mark the year 1838 as a calendar datein locomotive engineering, the slide valvewas first actuated at that time by the link,and its history of sixty years shows thatlap and the link have been inseparablein the progress of the slide valve. The eccentric, on the contrary, has re-mained the same eccentric since 1799,. r~^ Gf :;i Locomotttv Enffin ADJUSTING SCREW FOR ECCENTRIC RODS. making the pitch ratio as stated, the screwand eccentric rod will have a movement oflike distances, but in opposite arrangement is a refinement in rodadjustment that will appeal to the valvesetter as an easy and positive way tochange the length of a rod, as comparedwith the uncertainties of a jar with a ham-mer. The expense attending the fittingup, however, will no doubt prevent itsgeneral use. The device is the inventionof W. N. Reazor. Waverly, N. Y. i i S The Slide Valve and Eccentric. It is not a matter of common knowl-edge that the slide valve, as used on thelocomotive, did not have any outside lapuntil 1838, or nine years after the Rain-hill competitive tests, and its only func-tion at that time was to merely cover theports to prevent admission at both endsat one and the same time. There appears to have been no und
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Keywords: ., bookcentury1800, bookdecade1890, bookidlocomotiveen, bookyear1892
