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
valve back is recessedand is in communication with the exhaust arch £ by a centralhole. (Fig. 140.) Q. Can the Allen valve be balanced? A. Yes; in Figs. 141 and 142 such a valve is shown. Q. What is the rule for area of a single balance for plain Dvalves? A. 13/12 of the combined areas of one steam… … Fig. 141. Allen Balance Valve, Pennsylvania Railroad Engine,Class O. Central Lengthwise Vertical Section.
Locomotives
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