This is a very nicely produced republication of the 1922 Collins (no, not THAT Collins) Radio Amateur's Hand Book (no, not THAT Handbook). The original text was scanned and printed in a good modern font. The figures, however, were not redrawn, so they are a little fuzzy.
Forgotten Books makes this book available on-line for free browsing (but not downloading), or you can buy the hardcopy from Amazon. I recommend the hardcopy for easy reading. (Numerous other versions are available on-line, but many do not contain the illustrations, which are critical in this book.)
After publication of the 1922 revision, there was a review in QST that took the author to task for presenting various obsolete circuits and techniques, even by 1923 standards. For us in 2009, however, it is fascinating to read the details about how to construct spark gap and vacuum tube (CW) transmitters and their corresponding receivers, even though the historical progression is not thoroughly explained.
This is a book that belongs on every ham operator's history shelf.