Dingey, Peter Spear. [from old catalog] · New York, J. Wiley & sons · leaf 153
h the top of the box, but theports are only wanted the length indicated, by arrowpoints. This is to alUow core d e X.oh^ set into the core/; <f, after which small pieces of cores are nailed or pastedinto the upper parts of the slots which have not beenfilled by d e. The dotted lines in Fig. 163… … DOUBLE-BEAT VALVES. PATTERN MAKING. 89 DOUBLE-BEAT VALVES. The object of double-beat valves is to obtain a greaterpassage for the steam or water than can be had withsingle-beat valves of the same diameter and lift. Theyare sometimes called Cornish double-beat valves; thismay be due to the fact that…
Patternmaking
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
