Exceedingly scarce book which explains some routines with linking rings by some of the professionals of the time. Among them, Chefalo's routine is supposedly explained. Unfortunately, it is not so, just some passages are. Nevertheless, it's interesting, as this is the only instance where Chefalo's routine is described.
The book is mostly uncut, but in very poor condition, falling apart, due to the quality of paper of that years.
Guy Bert was a magic dealer from Paris.
The information about the published date comes from a review in "The Linking Ring".