▁federal ▁council ▁of ▁the ▁institution , ▁ ▁a ▁member ▁of ▁the ▁fin ance ▁committee . ▁For ▁Australian ▁Stand ards ▁Association ▁he ▁became ▁a ▁member ▁of ▁the ▁switch ge ar ▁committee . ▁He ▁was ▁also ▁President ▁of ▁the ▁Elect rical ▁Man ufact ur ers ' ▁Association ▁of ▁NS W ▁and ▁a ▁member ▁of ▁the ▁American ▁Institute ▁of ▁Elect rical ▁Engine ers . ▁ ▁A ▁month ▁after ▁the ▁death ▁of ▁his ▁wife , ▁in ▁ 1 9 6 3 , ▁Cro ok ▁had ▁a ▁minor ▁stroke . ▁ ▁This ▁forced ▁semi - ret irement . ▁He ▁closed ▁his ▁office ▁in ▁North ▁Sydney ▁and ▁then ▁did ▁a ▁limited ▁amount ▁of ▁work ▁from ▁home . ▁ ▁At ▁home ▁ ▁He ▁married ▁Mur iel ▁Water house , ▁the ▁daughter ▁of ▁Re ver ent ▁John ▁Water house ▁an ▁early ▁minister ▁of ▁the ▁Wes ley ▁Church ▁in ▁Hob art . ▁ ▁In ▁ 1 9 2 9 ▁they ▁built ▁a ▁house ▁in ▁Kill ara , ▁a ▁d orm itory ▁sub urb ▁for ▁gentlemen ▁ 1 4 ▁kilometres ▁( about ▁ 9 ▁miles ) ▁North ▁West ▁of ▁the ▁Sydney ▁Central ▁Business ▁District . ▁ ▁They ▁had ▁one ▁son , ▁Keith , ▁who ▁he ▁went ▁fish ing ▁with ▁along ▁the ▁South ▁Coast ▁of ▁New ▁South ▁Wales ▁with ▁two ▁ab original ▁men ▁Cro ok ▁had ▁met ▁during ▁installation ▁of ▁the ▁electric ity ▁transmission ▁in ▁the ▁area . ▁ ▁Cro ok ▁was ▁also ▁a ▁keen ▁gard ener ▁& ▁amateur ▁api ar ist . ▁ ▁Community ▁ ▁Cro ok ▁was ▁very ▁active ▁in ▁the ▁bro