Locomotive catechism; an up-to-date, practical and complete work on the locomotive--treating on the design, construction, repair and running of all kinds of locomotives .. (1908)
Grimshaw, Robert, 1850- [from old catalog] · New York, The N. W. Henley publishing company · leaf 249
Fig. 142. Allen Balanced Valve, Pennsylvania Railroad Engine,Class O. Vertical Cross Section. … Fig. 143. Allen Balanced Valve, Pennsylvania Railroad, Class O.Lengthwise Vertical Section to one side of Center. BRISTOL ROLLER VALVES. 243 A. Same as above, only minus the area of one side of theAllen port. Q. How was the Bristol roller slide valve made?A. The valve rested in a number of small…
Locomotives
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