ulsion ▁electric . ▁Str ict ly ▁speaking , ▁August ▁Sch er l ▁merely ▁provided ▁the ▁financial ▁backing . ▁The ▁right ing ▁mechanism ▁was ▁invent ed ▁by ▁Paul ▁Fr öh lich , ▁and ▁the ▁car ▁designed ▁by ▁Emil ▁Fal cke . ▁▁ ▁Although ▁well ▁received ▁and ▁performing ▁perfectly ▁during ▁its ▁public ▁demonstr ations , ▁the ▁car ▁failed ▁to ▁attract ▁significant ▁financial ▁support , ▁and ▁Sch er l ▁wrote ▁off ▁his ▁invest ment ▁in ▁it . ▁ ▁Sh il ov sky ' s ▁work ▁ ▁Following ▁the ▁failure ▁of ▁B ren nan ▁and ▁Sch er l ▁to ▁attract ▁the ▁necessary ▁invest ment , ▁the ▁practical ▁development ▁of ▁the ▁gy ro - mon or ail ▁after ▁ 1 9 1 0 ▁continued ▁with ▁the ▁work ▁of ▁Py otr ▁Sh il ov sky , ▁a ▁Russian ▁arist ocrat ▁res iding ▁in ▁London . ▁His ▁bal ancing ▁system ▁was ▁based ▁on ▁slightly ▁different ▁principles ▁to ▁those ▁of ▁B ren nan ▁and ▁Sch er l , ▁and ▁permitted ▁the ▁use ▁of ▁a ▁smaller , ▁more ▁slowly ▁spin ning ▁gy ros cope . ▁After ▁developing ▁a ▁model ▁gy ro ▁mon or ail ▁in ▁ 1 9 1 1 , ▁he ▁designed ▁a ▁gy ro car ▁which ▁was ▁built ▁by ▁Wol se ley ▁Mot ors ▁Limited ▁and ▁tested ▁on ▁the ▁streets ▁of ▁London ▁in ▁ 1 9 1 3 . ▁Since ▁it ▁used ▁a ▁single ▁gy ro , ▁rather ▁than ▁the ▁counter - rot ating ▁pair ▁fav oured ▁by ▁B ren nan ▁and ▁Sch er l , ▁it ▁exhib ited ▁asym