Webster’s Revised Unabridged Dictionary · 1913
Backlog
Back′log′ (-lŏg′; 115), n. [Back, a. + log.] A large stick of wood, forming the back of a fire on the hearth. [U.S.]
There was first a backlog, from fifteen to four and twenty inches in diameter and five feet long, imbedded in the ashes. S. G. Goodrich.