New Idea Manure Spreader
A full-page ad in a 1918 issue of Country Gentleman magazine.
Some history :
"In 1899, an Ohio schoolmaster named Joseph Oppenheim witnessed a unique problem. Farm boys were often missing class to clean barns and spread manure. In his quest for a solution, Oppenheim developed the first commercially successful mechanical manure spreader. It was affectionately called Oppenheim's New Idea"
The spreaders were designed to be horse-drawn in those days.