Green’s Dictionary of Slang

Bertha Winder n.

[rhy. sl.]

a cinder.

Eve. Tel. (Dundee, Scot.) 3 Aug. 4/1: He had no breakfast as the ‘New York Nippers’ were burnt up to a ‘Bertha Winder’ and the ‘treacle’ (‘treacle toffee’ – coffee) was stone ‘Harry’ (‘Harry Gold’ - cold).