2   m ph ▁( 3 5   km / h ). ▁The ▁transmission ▁was ▁electric , ▁with ▁the ▁pet rol ▁engine ▁driving ▁a ▁generator , ▁and ▁electric ▁mot ors ▁located ▁on ▁both ▁bog ies . ▁This ▁generator ▁also ▁supplied ▁power ▁to ▁the ▁gy ro ▁mot ors ▁and ▁the ▁air ▁compress or . ▁The ▁bal ancing ▁system ▁used ▁a ▁p neum atic ▁ser vo , ▁rather ▁than ▁the ▁fr iction ▁whe els ▁used ▁in ▁the ▁earlier ▁model . ▁ ▁The ▁gy ros ▁were ▁located ▁in ▁the ▁cab , ▁although ▁B ren nan ▁planned ▁to ▁re - site ▁them ▁under ▁the ▁floor ▁of ▁the ▁vehicle ▁before ▁displaying ▁the ▁vehicle ▁in ▁public , ▁but ▁the ▁un ve iling ▁of ▁Sch er l ' s ▁machine ▁forced ▁him ▁to ▁bring ▁forward ▁the ▁first ▁public ▁demonstr ation ▁to ▁ 1 0 ▁November ▁ 1 9 0 9 . ▁There ▁was ▁ins u fficient ▁time ▁to ▁re - position ▁the ▁gy ros ▁before ▁the ▁mon or ail ' s ▁public ▁debut . ▁ ▁The ▁real ▁public ▁debut ▁for ▁B ren nan ' s ▁mon or ail ▁was ▁the ▁Japan - B rit ish ▁Ex hib ition ▁at ▁the ▁White ▁City , ▁London ▁in ▁ 1 9 1 0 . ▁The ▁mon or ail ▁car ▁carried ▁ 5 0 ▁passengers ▁at ▁a ▁time ▁around ▁a ▁circular ▁track ▁at ▁ 2 0   m ph . ▁Pass engers ▁included ▁W inst on ▁Church ill , ▁who ▁showed ▁considerable ▁enthus ias m . ▁Interest ▁was ▁such ▁that ▁children ' s ▁clock