“Bang­ing Out” was a way of news­pa­per print­ers com­mem­o­rat­ing some­thing spe­cial: a long-serv­ing employ­ee retir­ing or even the clo­sure of the press­es.  This short film, via. Typore­tum, explains the tra­di­tion.

Source: Bang­ing Out – Fleet Street Remem­bered. – A Blog about Typog­ra­phy, Let­ter­press and Print­ing His­to­ry | News from Typore­tum