A large log placed at the back of the chimney.
1684. The spit was carried up chimney, and came down with the point forward, and stuck in the back-log.Increase Mather, Remarkable Providences, chap. v. (N.E.D.)
1788. The snake was so strong, that he made his escape, and took shelter behind the back-log, until the heat drove him from thence.American Museum, iv. 519/1 (Sept.).
1793. He found his companion lying in a large body of live coals, her head on the back log and knees on the forestick.Mass. Spy, March 7.
1817. You should make up your fire [in the woods] with a fallen tree for a back-log.M. Birkbeck, Journey in America, p. 166 (Phila.).
1824. Does he throw her into the fire, or does he throw her behind the back log? No.Howard Gazette (Boston), March 27: from The Port Folio.
1846. We next proceeded to build a fire, which was facilitated by taking advantage of a dead tree for a back-log.T. B. Thorpe, Bob Herring, p. 135.
1847. In the morning, a buckeye backlog and hickory forestick resting on stone andirons, with a Johnny-cake on a clean ash board, set before it to bake.Dr. D. Drake, Pioneer Life in Kentucky, p. 106 (Cincinnati, 1870).
1852. The log has been placed; the back-log has surmounted it; the top-stick crowns the apex; the fore-stick rests against the and-irons; and the intermediate cob-house of timber, fired by the faithful kindling-wood, is all a-blaze, and roaring up the chimney.Knick. Mag., xxxix. 203 (Feb.).
1859. It was a cold morning: but the log was in the fireplace; crowned with the back-log, middle-log, and top-stick. [For the rest of the quotation see FORE-STICK.]Knick. Mag., liii. 324 (March).
1878. Backlog and forestick were soon piled and kindlings laid, and the fire roared and snapped and crackled up the ample chimney.H. B. Stowe, Poganuc People, ch. ix.