The Mayalls start this book with a fanciful Mrs. Caveman (this was written in 1934, remember) reminding Mr. to bring his shadow-stick so he'd be home from the hunt in time for chores. That gets the first aspect of the book off to good start, desribing the incredible variety of sundials known through history. The menagerie includes everything from pocket-sized "shepherd's" dials to major pieces of architecture. It includes dials that show only morning hours (on an east wall of a building), a garden laid out like a sundial with topiary gnomon, and even a moon-dial for night-time hours.
The other major feature of this book, interleaved with the first, gives detailed directions for making many kinds of sundial: wall-mounted, horizontal, and many more. The instructions show how to adapt dials to any northern longitude or latitude, giving time accurate to the minute. I imagine the dedicated reader could adapt the directions to the southern hemisphere, where the shadow's direction is reversed. The intermediate latitudes, between the tropics of cancer and capricorn, present interesting problems that I did not see addressed, however. In that equatorial band, the sun acts "northern" for part of the year and "southern" for the rest. I would have liked to see examples of how this challenge is overcome.
That's nit-picking, though. It's an approachable book with fascinating examples and clear instruction without daunting math. I recommend it to anyone interested in making sundials of their own, or who just want to know more about their history.
//wiredweird