Back again after some years out of print as, even if it is well over a hundred years old, this really is still a cracking book!
It may not include the most modern injectors, but the science of injectors was well developed when it was published, and it does cover all injectors and ejectors of the period in considerable detail.
More importantly for those wanting to build their own injector or ejector, it includes many formulae to help with designing one which will really work.
210 pages, softback