Patent for improvements in spark-arresters for smoke-pipes by using a “combination of a bent smoke-pipe having one complete turn downward, a cinder-piper opening into the lowest portion of said turn, and a coarse wire screen titled backward and overhanging said turn, a receptacle having a slanting bottom hinged at the upper end and secured at the lower end by means of a chin passing over a suitable roller and leading to the rear of the boiler,” (p. 2, lines 20-28) illustration is included.