The thread next door to the one just placed is now moved down to the vacant place at the bottom.
8 to (7) This leaves a vacancy upstairs at 8 .....
........... so the next move is to take the thread at the bottom next door and to the right of the thread just placed and move it up to that vacant place as illustrated. (8) to 8
These up and down movements continue as will be seen in the following photographs, 9 to (8)