I am way off my base here but I hope you won't mind too much.
I am a small repair center for underground locating equipment. Some of my clients are oil companies and for several months now they have been asking us to repair Barton Hydrostatic Recorders. So we have been looking for info about training for this task. So far we can neither find the Barton manufacturing or their service center. Perhaps someone on this site might have some info for us. If so I would be grateful for your assistance. Sorry that I have no technical question to stump you with but I always have a good Joke. Maybe Later. Thank you for allowing me to visit and thank you in advance if you can assist me on this matter. Bob