Thanks for the link, Dave.
This is a section of The Knowledge I feel could use more development. Pyrolosis products, I think, are especially central to the project, as wood will be pretty much universally available, and very low-tech approaches produce a useful range of products.
The illustration (as often the case throughout the book) is unlabeled, and depicting the industrial scale apparatus offers less help to the small-timer. I'd like to see a range of techniques, starting with early field methods for gathering pitch, baking wood in open fires and separation techniques (where possible) which don't rely on distillation.
An accompanying table of products and their associated chemical description, properties and a range of uses would be valuable (as for each process in the book).
One of the particular applications of creosote(?) I'd like to see included is as anti-fouling for boats. I know of it as a possibility, but without the techniques. As I understand it, it was practiced until recently in the British Isles. The film depiction I saw hinted at important procedures, but did not go into them. [The Secret of Roan Innish... great movie with whitewashing and thatching, too, also shown without full techniques... close your eyes as the 'fishermen' try to row!).