A borrowed image of this painting (source not acknowledged) on Ken Bryant's error-prone website states that it is a 6 x 4 panel, whereas it is in fact a 10 x 7 inch painting.

The story of how that group of weary workers (seen in the distance at the left) was used in his much later (1934) book, "A Stepladder to Painting" is told here: http://www.janandcoragordonart.com/2014/09/jan-gordon-emotion-in-painting.html