ft ▁ 6 in ▁by ▁ 1 2   inch ▁( 7 6 2   mm ▁by ▁ 3 0 0   mm ) ▁box ▁containing ▁the ▁bal ancing ▁system . ▁However , ▁this ▁was ▁sufficient ▁for ▁the ▁Army ▁Council ▁to ▁recommend ▁a ▁sum ▁of ▁£ 1 0 , 0 0 0 ▁for ▁the ▁development ▁of ▁a ▁full - size ▁vehicle . ▁This ▁was ▁v eto ed ▁by ▁their ▁Fin an cial ▁Department . ▁However , ▁the ▁Army ▁found ▁£ 2 0 0 0 ▁from ▁various ▁sources ▁to ▁fund ▁B ren nan ' s ▁work . ▁ ▁Within ▁this ▁budget ▁B ren nan ▁produced ▁a ▁larger ▁model , ▁ 6   ft ▁( 1 . 8 3 m ) ▁long ▁by ▁ 1   ft ▁ 6 in ▁( 0 . 4 6 m ) ▁wide , ▁kept ▁in ▁balance ▁by ▁two ▁ 5   inch ▁( 1 2 7   mm ) ▁diameter ▁gy ros cope ▁rot ors . ▁This ▁model ▁is ▁still ▁in ▁existence ▁in ▁the ▁London ▁Science ▁Museum . ▁The ▁track ▁for ▁the ▁vehicle ▁was ▁laid ▁in ▁the ▁grounds ▁of ▁B ren nan ' s ▁house ▁in ▁G illing ham , ▁Kent . ▁It ▁consisted ▁of ▁ordinary ▁gas ▁pip ing ▁laid ▁on ▁wooden ▁sleep ers , ▁with ▁a ▁fifty - foot ▁wire ▁ro pe ▁bridge , ▁sharp ▁corners ▁and ▁s lop es ▁up ▁to ▁one ▁in ▁five . ▁B ren nan ▁demonstrated ▁his ▁model ▁in ▁a ▁lecture ▁to ▁the ▁Royal ▁Society ▁in ▁ 1 9 0 7 ▁when ▁it ▁was