The literary device that Gordimer employs in the excerpt is Imagery.
Imagery is a literary device used to represent objects, actions, and ideas in such a way that it appeals to our physical senses. Usually it is thought that imagery makes use of particular words that create visual representation of ideas in our minds.
Informal speeches or fireside chats on the radio
Working in fields as their job
Yes I think that's true well that's your awnser