"Just as an fyi... The terms "tangential tracking" and "linear tracking" both are acceptable. Of the manufacturers of these arms over the years, B&O, Rabco, Marantz and others used the term "tangential tracking" and Eminent Technology, Air Tangent, Walker Audio, Clearaudio, Kuzma and others used the term "linear tracking." All the rest of us (and most reviewers) just used the terms interchangeably."
Be that as it may and regardless of who used what, conceptually these arms are attempting to maintain a proper tangential relationship to the groove all the way across the record rather than at just two points. Michael Fremer mentioned this in one of his recent articles. In his opinion and mine, linear is a misnomer. YMMV