There being a spirited discussion elsewhere on the forum about various devices claimed to improve stringed instruments by artificially vibrating them, I thought a few people here might be interested in a new book that that collects the various articles written by the late Australian luthier Graham Caldersmith on guitar and violin acoustics. Nothing specifically on mandolins, but there is a lot of relevant information which may just help people better understand how stringed instruments make musical sounds. There is some info on my website.
http://www.mcdonaldstrings.com/caldersmith_papers.html
where you can download the introductory chapter with a table of contents and a short bio of Graham Caldersmith.
It is available from Amazon
https://www.amazon.com/Caldersmith-P.../dp/0648588017
or any good bookshop in the US or Canada should be able to get you a copy from IPG (ipgbook.com) in Chicago.
Full disclosure - I am the publisher and sales may eventually make enough to take Graham Caldersmith's partner out for a nice dinner somewhere.
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