The armature winding used in d.c. machines are closed and double layer. Each of the coil has its upper coil side placed at the top of one slot and lower coilside placed at the bottom of another slot which is approximately one pole pitch away.
In the Fig. 1 the winding having 4 coilsides per slot are shown.
The coilside 2 is under coilside 1 while coilside 4 is under coilside 3.