▁refer ▁to : ▁▁ ▁R ural ▁Municip ality ▁of ▁Glen ▁Mc Ph erson ▁No . ▁ 4 6 , ▁a ▁local ▁government ▁in ▁S ask atch ew an , ▁Canada ▁ ▁Glen ▁Mc Ph erson , ▁a ▁member ▁of ▁the ▁S ask atch ew an ▁Legisl ative ▁Assembly ▁( 1 9 9 1 – 2 0 0 0 ) <0x0A> </s> ▁The ▁RA Y D AC ▁( for ▁Ray the on ▁Digital ▁Autom atic ▁Computer ) ▁was ▁a ▁one - of - a - kind ▁computer ▁built ▁by ▁Ray the on . ▁ ▁It ▁was ▁started ▁in ▁ 1 9 4 9 ▁and ▁finished ▁in ▁ 1 9 5 3 . ▁It ▁was ▁installed ▁at ▁the ▁Naval ▁Air ▁Miss ile ▁Test ▁Center ▁at ▁Point ▁M ug u , ▁California . ▁ ▁The ▁RA Y D AC ▁used ▁ 5 , 2 0 0 ▁vac u um ▁tub es ▁and ▁ 1 8 , 0 0 0 ▁cry stal ▁di odes . ▁ ▁It ▁had ▁ 1 , 1 5 2 ▁words ▁of ▁memory ▁( th irty - six ▁bits ▁per ▁word ), ▁using ▁delay ▁line ▁memory , ▁with ▁an ▁access ▁time ▁of ▁up ▁to ▁ 3 0 5 ▁micro seconds . ▁ ▁Its ▁addition ▁time ▁was ▁ 3 8 ▁micro seconds , ▁multiplication ▁time ▁was ▁ 2 4 0 ▁micro seconds , ▁and ▁division ▁time ▁was ▁ 3 7 5 ▁micro seconds . ▁ ▁( Th ese ▁times ▁exclude ▁the ▁memory ▁access ▁time .) ▁ ▁See ▁also ▁List ▁of ▁vac u um ▁t