How do you create a "finger wave" hair style (from the 1920s)?

I see it often on female celebrities even today.

How do you create a "finger wave" hair style (from the 1920s)?

It's not an easy style to create . It helps if the person has a bit of wave to their hair.

Use a real slippery type gel

Make a part in the hair where desired.

Comb the hair in whichever direction the hair grows naturally.

(some hair grows forward)

Apply your fingers horizontal to the part and then comb the hair in the opposite direction. And squeeze the hair that you have in between your fingers.

Repeat

Repeat

How do you create a "finger wave" hair style (from the 1920s)?

I think you should google it =)