"Dyke's Aircraft Engine Instructor" is quite a big book; well over 400 pages.
It is a quality publication and as good a reference for pre-1930's engines as you can get anywhere.
Copies are regularly up for sale on "Abebooks" and E-Bay usually at reasonable prices.
In my opinion, well worth the effort and money to get a genuine copy. It's a "must" for any aero-engine library.