If the salary of an industrial worker was so low that they barely survived and couldn't even dream of ascending to upper classesclasses¹, what kept them from revolting all the time? One could argue that there was always a great number of unemployed workers just waiting to substitute employed ones when these went on strike, but how did those unemployed workers survive if they had no income?
¹Mentioned in Hobsbawm's "The Age of Revolution: 1789-1848" and further explained in "The Age of Capital: 1848-1875"