It was preferred from the early 20th century for its ease of use in comparison with fully handbook gearboxes of that point.  Commonly, there are two sets of gears in a standard gearbox – the input & the output. The enter gears are preset on the countershaft, creating them one https://lorenzojprsb.bloggerbags.com/39456464/5-simple-statements-about-automobile-gearbox-explained