Yellow-bellied, nose-to-the-grindstone workers.

[Chief Sapulpa]

This picture circa 1900s shows knife grinders also called
ventres jaunes ('yellow stomachs' referring to the
yellow dust released by the grinding wheel). By laying
face down, these yellow stomachs would save their
backs from being hunched over all day. Workers were
encouraged to bring their dogs to not only keep them
company, but to act as heaters to keep them warm by
having the dogs lie on their legs.
(Photo is from the web-site of, French knife maker,
Claude Dozorme - " The Wolf ")

 

[Letfreedomring]

I bet coffee was consumed in record amounts especially after lunch!