    Seritencé 1: Ina. 4eylindér ‘compouid ‘erigine, what.  degree were the indivdual pistons balanced. at?    Sentence. 2: Wiien “ihe. double “expansion “grdiyp.’ is.  duplicated” producing a: f-cylinder. compound. the  individugl pistons...within, the, graup- are sud  “Dakanced wt 186", the oroups.berrig set_at.90° t9 en  other.