. Railway and Locomotive Engineering . Gear is be-ing received among railroad men wher-ever its merits have had the opportunityof becoming thoroughly known, and themany inquiries that have come to us re-garding the details of its mechanism, in-duces us to give more than a mere pass-ing nnticc to its constructinii and ad- It will be readily observed tliat the de-vice resembles the Walschacrts valvegearing in two important particulars. Theeccentric crank, which gives the valve itsmotion, is attached to the main crank \ combination lever deriving its motionfrom the crosshead gives the valve
. Railway and Locomotive Engineering . Gear is be-ing received among railroad men wher-ever its merits have had the opportunityof becoming thoroughly known, and themany inquiries that have come to us re-garding the details of its mechanism, in-duces us to give more than a mere pass-ing nnticc to its constructinii and ad- It will be readily observed tliat the de-vice resembles the Walschacrts valvegearing in two important particulars. Theeccentric crank, which gives the valve itsmotion, is attached to the main crank \ combination lever deriving its motionfrom the crosshead gives the valve itsposition in relation to the steam important variation lictwccn the wlion applied to locomotives it travelsthrough a longer extended arc than isusual in the case of links, oscillating, asin the Walschaerts gcarirg, on a fixedcenter. Other valve gearings have over-come this drawback, notably that of theCorliss valve gear, but the delicate mech-anism of that gearing render its applica-tion to locomotive service THK LOCOMOTIXK V.\LVK OUTSIDE .\1)M justment. Like the Walschacrts valvegear, its arrangement outside of the lo-comotive frames meets a necessity in thetwentieth century locomotives where thelimited space between the frames withthe increasing size of axles and eccentricshas rendered it particularly difficult toadjust or examine the Stephenson valvegearing. Baker valve gearing and the Walschacrtsvalve gearing consists in the absence of aradial link, whether shifting or fixed. Asis well known, the link motion on anyform or method of application is asource of error in all valve motions onaccount of the slipping of the link-block,and is more noticeable in the case of theshifting link, as in general construction In view of these facts it will be readilyunderstood that if the motion of a slidingvalve can be perfectly controlled and thelength of stroke varied without the in-tervention of a radial link, a real gainin the use of s
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Keywords: ., bookcentury1900, bookdecade1900, bookpublishernewyork, bookyear19
