What dancers need to know about the zigzag dance
a) Couples progress towards the end of the set to which their left shoulders initially point. In practice caller should reference geometric features of  the hall (e.g. windows)
b) Each cycle through the dance leave dancers progress, but on the opposite side of the set
c) The one poussette in each cycle of the dance is CW and moves dancers in the direction of progression

d) Dancers out at the end  dancers out at the end face back in with the lark on the right, ready to re-enter the dance with either a poussette or a balance and petronella 

 

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For those interested, a complete geometric analysis of the dance including end effects follows
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The one pousette in each cycle is CW and moves dancers in the direction of progression.

The poussette in the first  cycle is around the current neighbors

The poussette in the second cycle is around the new neighbors.

After the poussette in the [first]/[second] cycle, new neighbors are found  [in]/[opposite to]  the dancers'   direction of progression.

The balance and petronella  after the poussette  always occurs with the new neighbors

Couples out at the end always  face back in with the lark on the right.

Dancers out at the start of the first cycle, re-enter the dance with the balance and petronella which follows the poussette

Dancers out at the start of the second cycle, re-enter the dance with the poussette

Starting the dance at 5) has the dance cycle between the 2's and the 1's being crossed over.