It was preferred during the early 20th century for its ease of use compared to thoroughly handbook gearboxes of that point.  Normally, there are two sets of gears in a standard gearbox – the input & the output. The input gears are fastened about the countershaft, earning them one models. https://andrejllkg.bloggadores.com/33334607/5-easy-facts-about-automobile-gearbox-described