In A Short Course in General Relativity, Forster and Nightingale, page 236, it describes how the Lanchester's transporter operates. According to the diagram, I think the pointer would turn clockwise when the Lanchester's transporter travels a right-hand bend, however, the paragraph said it rotates anticlockwise. Second, why is there a one half in the expression of the angle of rotation? Is it because there are "two" pinions? Any help would be appreciated!