Has anyone else thought that the Nomograph section (Chapter 15) of the How To Brew by John Palmer has confusing information? I have read through the chapter from the start where it explains how, using a nomograph, you can calculate the Residual Alkalinity of your mash water. It then goes on to explain how you can work out how to adjust your source water to get a style of beer you desire by marking up further points on the nomograph to deduce the chemistry needed to affect a change. They produce a chart such as below. Then, at the very end of the chapter, they display a similar nomograph you can also download that gives you the ability to work out your mash chemistry. The problem I have is that this downloadable nomograph does NOT have the same detail at the top of the previously displayed charts. The Mash pH graduations, as shown above, do not exist. There is only a Change in Mash pH graduation above the Residual Alkalinity marks. So how do we determine what these marks mean? I can not see an explanation in the text - not one I understand fully anyway - so I have modified the nomograph to replicate the tutorial in the chapter. I would welcome anyone's input as to whether I have done it accurately nor not - or indeed if it is any use at all.