Very good from what I can gather. I tried to translate what was written about the crane's arm and I ended up with a this as an explanation:following the extension of the two arms of a tenon, j' Al thought qu' L was necessary lengthened the jack, the result is very good, because: that allows the arm provided with the hook with higher gone up. It n' more l' has; air to hang in the vacuum. I was wondering if you could possibly translate this a bit better into English than I did :)