. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . complimented his offi-cers and men at Susquehanna on theirsplendid performance. A New Design in Valve Gear*. Since l«42, when the Stcpliensons|,laccd on their locomotives the firstreversible valve gear, which was theunpatented product of the mind of youngWilliam Williams, one of their draughts-men, there have been invented upwardsof fifty reversible motions, each calculatedti> improve the functions of steam admis-sion and exhaust, together with the com-plications resulting from the neces-
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . complimented his offi-cers and men at Susquehanna on theirsplendid performance. A New Design in Valve Gear*. Since l«42, when the Stcpliensons|,laccd on their locomotives the firstreversible valve gear, which was theunpatented product of the mind of youngWilliam Williams, one of their draughts-men, there have been invented upwardsof fifty reversible motions, each calculatedti> improve the functions of steam admis-sion and exhaust, together with the com-plications resulting from the neces- RAILWAY AND LOCOMOTIVE ENGINEERING. July, igio. sity for variations in cut-ofF, lap, leadand quick port opening. It seems re-markable, considering the ingenuityof valve gear inventors, therefore, thatonly the designs of William Williams(the shifting link) and of Egade Wal- of the points above mentioned, it willbe seen that for 25 per cent, of the pis-ton travel from the front end, thecrank has traveled 4/^ parts of thecrank circle; for 50 per cent., 6J4 parts,and for 75 per cent., 9 parts. On the. MiiDEL OF THE PILLIOD BROTHERS NEW VALVE GEAR. schacrts should have survived throughthe decades marked by so many radicalimprovements in the general design ofthe railway locomotive. And it be-speaks much for the rare attainmentsof these two inventors, and the magni-tude of the problem with which theycoped. A design, which differs from any-thing heretofore successfully produced,both in principle and effect, has beenperfected by Messrs. Charles andHenry Pilliod, and is shown in ourhalf-tone and drawings. Some of thefeatures claimed for the Pilliod gearare: A uniform cut-ofi, uniform re-lease, a possible 25 per cent, cut-offwith a 75 per cent, release and a laterelease in the working notches of thequadrant. In the design of any valvemotion the first consideration must bethe action of the parts furnishing thepower. The troubles of the valvegear designers lie principally in thedifficulty
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