</s> ▁Ch ient ina ▁is ▁a ▁village ▁in ▁T usc any , ▁central ▁Italy , ▁ ▁administr atively ▁a ▁fra zione ▁of ▁the ▁comune ▁of ▁Ter ric ci ola , ▁province ▁of ▁P isa . ▁ ▁Ch ient ina ▁is ▁about ▁ 3 2   km ▁from ▁P isa ▁and ▁ 5   km ▁from ▁Ter ric ci ola . ▁ ▁References ▁ ▁Bibli ography ▁▁▁▁ ▁Category : F raz ioni ▁of ▁the ▁Province ▁of ▁P isa <0x0A> </s> ▁The ▁Jones ▁C ounter ▁is ▁a ▁device ▁fitted ▁to ▁the ▁front ▁wheel ▁of ▁a ▁b icy cle ▁that ▁counts ▁the ▁revolution s ▁of ▁the ▁wheel . ▁It ▁was ▁invent ed ▁in ▁ 1 9 7 1 ▁by ▁Alan ▁Jones ▁in ▁order ▁to ▁measure ▁the ▁length ▁of ▁road ▁running ▁race ▁courses . ▁The ▁counter ▁has ▁g ears ▁that ▁drive ▁a ▁mechanical ▁digital ▁counter . ▁One ▁count ▁typically ▁corresponds ▁to ▁about ▁ 1 / 2 0 th ▁of ▁a ▁wheel ▁revolution ▁( this ▁var ies ▁if ▁a ▁different ▁g ear ▁ratio ▁is ▁used ); ▁this ▁provides ▁a ▁resolution ▁of ▁about ▁ 1 0   cm ▁in ▁course ▁length , ▁although ▁overall ▁accuracy , ▁depending ▁on ▁cal ibration ▁and ▁other ▁factors , ▁is ▁lower , ▁but ▁normally ▁better ▁than ▁ 1 ▁part ▁in ▁ 1 , 0 0 0 . ▁ ▁Mod els ▁ ▁Cla in ▁Jones ▁C ounter ▁ ▁On ▁the ▁right ▁is ▁the ▁original ▁production ▁version , ▁manufact ured ▁by ▁Alan ▁Jones ' s ▁son ▁Cla in ▁from ▁ 1 9 7 3 ▁to ▁