▁the ▁b ells . ▁ ▁B ells ▁hung ▁for ▁full ▁circle ▁ring ing ▁are ▁sw ung ▁through ▁just ▁over ▁a ▁complete ▁circle ▁from ▁mouth ▁upp erm ost . ▁ ▁A ▁stay ▁( the ▁wooden ▁pole ▁seen ▁stick ing ▁up ▁when ▁the ▁b ells ▁are ▁down ) ▁eng ages ▁a ▁mechanism ▁to ▁allow ▁the ▁bell ▁to ▁rest ▁just ▁past ▁its ▁balance ▁point . ▁ ▁The ▁ro pe ▁is ▁attached ▁to ▁one ▁side ▁of ▁a ▁wheel ▁so ▁that ▁a ▁different ▁amount ▁of ▁ro pe ▁is ▁w ound ▁on ▁and ▁off ▁as ▁it ▁sw ings ▁to ▁and ▁fro . ▁The ▁b ells ▁are ▁controlled ▁by ▁ring ers ▁( one ▁to ▁a ▁bell ) ▁in ▁a ▁chamber ▁below , ▁who ▁rotate ▁the ▁bell ▁to ▁through ▁a ▁full ▁circle ▁and ▁back , ▁and ▁control ▁the ▁speed ▁of ▁oscill ation ▁when ▁the ▁bell ▁is ▁mouth ▁up wards ▁at ▁the ▁balance - point , ▁when ▁little ▁effort ▁is ▁required . ▁ ▁Sw ing ing ▁b ells ▁are ▁sound ed ▁by ▁an ▁internal ▁cla pper . ▁ ▁The ▁cla pper ▁may ▁have ▁a ▁longer ▁period ▁of ▁swing ▁than ▁the ▁bell . ▁In ▁this ▁case ▁the ▁bell ▁will ▁catch ▁up ▁with ▁the ▁cla pper ▁and ▁if ▁r ung ▁to ▁or ▁near ▁full ▁circle ▁will ▁carry ▁the ▁cla pper ▁up ▁on ▁the ▁bell ' s ▁trailing ▁side . ▁ ▁Alternatively , ▁the ▁cla pper ▁may ▁have ▁a ▁shorter ▁period ▁and ▁catch ▁up ▁with ▁the ▁bell ' s ▁leading ▁side , ▁travel ▁up ▁with ▁the ▁bell ▁coming ▁to ▁rest ▁on ▁the ▁down hill ▁side