"I should add that the information on rungs and protruding bricks is on p74."
Finally got through to your book Steve - which reads "pages 73 to 74 are not available in this preview".
Nevertheless, the pages that are available carry enough description to back up every other account (such as this one http://histclo.com/act/work/area/work-sweep.html ) of the trade having no aids whatever for the young boys who worked at it.
"Inexperienced sweeps sometimes stuck fast in perpendicular flues This was likely to happen when a flue branched off (see Appendix).
The flue, instead of being the same width throughout its length, contained wider sections. Problems arose when the climbing boy descended. He unconsciously allowed his knees to rise in the enlarged section of flue, and in that position slid down into the more constricted part and became wedged, remaining for many hours with his knees and back pressed against the sides of the flue. Extraction was painful; another boy had to tie a rope to his ankles and draw his legs down, or pull his arms up from above. If this failed, then a portion of brickwork was removed. Master Sweeper H. Chidlow" reported that when he was young he had stuck fast in a flue for seven hours and that his brother had lost his life in a flue at Wolverhampton."
Still no apology forthcoming
Jim Carroll