Several regular visitors from Sepia Saturday have in the past commented on the length of some of my articles and asked how long it takes me to compile them. The short answer is How long's a piece of string? because some (e.g SS173) are off the cuff, while others are years in the making, gestating slowly either in my mind or as an accumulating collection of notes on the computer's hard disk. This week's contribution is one of the latter, a culmination of some four years of research, the…
