Patrick Moore 
More Small Astronomical Observatories [PDF ebook] 

Almost every serious amateur astronomer knows the benefit of having a fixed observatory of some sort – it saves a vast amount of time and effort during every observing session – and this book provides the necessary help. More Small Astronomical Observatories details the methods and techniques employed by non-professional astronomers from all over the world, providing a wonderful resource for anyone wishing to build a small observatory of almost any kind. It’s a fun read, too.