I have a collection of marine chronometers and wish that I had this book when I started collecting some 10 years ago. It was out of print and second-hand copies were rare and often expensive.
The new edition is well put together and the inclusion of Rupert Gould's notes for a never-published second edition make it more interesting. I strongly recommend this edition of this classic book.
For purchasers who want an easy to read book on the practical operation and maintenance of a marine chronometer, I have found the recently published "The Mariner's Chronometer" by Bill Morris to be excellent The Mariner's Chronometer: Structure, function, maintenance and history.
. It complements Rupert Gould's masterpiece.