WatchTech

I am curious about how the energy stored in the main spring is consumed in the movement. Aerodynamic drag on the balance wheel and hairspring, impact noise from the escapement, bearing friction etc. etc. all use energy but I have no idea of the relative c... 

Hi ausrandoman, I am not aware of any books in English that treat this subject, but in French this book treats the losses in a watch movement, especially the escapement, in detail: Traité de construction horlogère Michel Vermot, Philippe Bovay, Damien Pro... 

I just ordered a copy. I think I am quickly going to add a few hundred words to my French vocabulary :)

if this book will ever be translated into English Don? -O

As far as I know there is next to no watch development being done in English speaking countries. German, French, Japanese, Chinese, yes there is a market. In the English speaking area there will be only a few hobbiests to buy it. Here in the Swiss/French ...