Ripper, William, 1853-1937 · London, New York [etc.] : Longmans, Green and co. · leaf 103
expansion valve with angular anvance ^, then Oa is the distanceof the main valve from its middle position, and 06 the distance of theexpansion valve ; also ab is the distance between the respective centresof the two valves. If now OD, Fig. 92, be drawn equal and parallelto EM, and a perpendicular… … may be considered as an eccentric with angular advance y8 andeccentricity OD, which governs, for any part of its path, the rela-tive position of the centres, or the relative motion of the mainand expansion valves. On OM (Fig. 93) describe the main-valve circle, and on OEdescribe the expansion-valve…
Steam-engines
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![An illustration from L'optique divisée en trois livres : ou, l'On démontre d'une maniere aisée tout ce qui regarde 1. la propagation & les proprietez de la lumiere. 2. La vision. 3. La figure & la disposition des verres qui servent à la perfefectionner [sic] (1682)](https://img.insideoutlibrary.com/img/200/ia-loptiquedivise00ango-108-12.webp)