French Clock Pendulum Length Calculator. Home › Forums › Hints, Tips and Tricks › French Clock Pendulum Length Calculator. This topic is empty. Viewing 2 posts - 1 through 2 (of 2 total) Author Posts May 7, 2013 at 12:39 pm #48604 aruthaParticipant Topics Started: 85Total Posts: 1536 Found this handy calculator for French clock pendulum lengths on the Meadows & Passmore site. http://www.m-p.co.uk/formulae/frpend.htm May 8, 2013 at 10:19 am #53559 willofiamModerator Topics Started: 75Total Posts: 1437 excellent info Paul, just what I needed, your the best!!!!! William Author Posts Viewing 2 posts - 1 through 2 (of 2 total) You must be logged in to reply to this topic. Log In Username: Password: Keep me signed in Log In aruthaFrench Clock Pendulum Length Calculator.