A look at WW1 tank engines.

This article takes a limited look at the engine technology of the English WW1 tank. The pictures come from a book that I was lucky enough to see at a "pre- wedding BBQ", my attempts to convince the Bride's father to sell it to me have not proved successfull, but he has allowed me to borrow it and scan some of the pages.

The book is "The High-Speed Internal-Combustion Engine" Ricardo and Glyde, Third Edition and was printed in 1944 (originally printed in 1923). Considering the subject matter, it must have been curiously out of date in its latter printings and I find it puzzling that they even bothered to print it, given the leap in technology that occured over that period.

The pictures are self explanatory. The first couple are external vehicle views, followed by engine views, crew space views, some specification sheets and then drawings.
You will notice that the pictures suffer from a diamond shaped interference pattern, which is not on the original.
I have been told this is called moire pattern. Essentially the problem is that the original is not a continuous picture like a photographic print, but a collection of dots.
The scanner scans the image as a series of pixels. If the spacing of the pixels scanned is similar to the spacing of the dots in the original, then you get this sort of interference.
I believe scanners with good quality interface programmes can correct for this during the scan process. Nothing I have will do so as I no longer have access to the book to re-scan the pics.