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Alternative early 'big wheel' designs on the lines of the Russian tsar tank of were soon understood to be impractical. The term tank , as in water tank, was in December finally accepted as its official designation. An engineer in the Austro-Hungarian Army , Lieutenant Gunther Burstyn , inspired by Holt tractors, designed a tracked armoured vehicle in carrying a light gun in a rotating turret; equipped also with hinged 'arms', two in front and two at the rear, carrying wheels on the ends to assist with obstacles and trenches, it was a very forward-looking design, if rather small. They were featured in films and popular songs.