I discovered My Viola and I, the autobiography of Lionel Tertis, in the library at Magic Mountain. It's a charming read with great anecdotes of musical life in the last century and including sections on the design of his own model and his physical problems that led him to stop playing. And there's a whole section at the end with playing advice: 'Long hair and locks over the right or left eyebrow are nauseating to look at and utterly useless in furthering musical capability.'