A Two Stage Digester. Large Single Stage Plant. A Single stage multiple digester plant. A Vegetable digesting gas Plant. Clear drawings are supplied with the plans as well as parts list.
Theory of operation is supplied and is detailed but easily understood.
But sometimes I do earn money like a big publishing firm. A booklet IS a simple thing, it's pages prepared from ordinary typewriter copy and stapled or folded together by hand. Most booklets can be made in less than a minute. This book and plans,includes patents, drawings and necessary instructions for the most notable types. A Must for the alternative minded mechanic or technician.