Names of ancient Japanese timekeeping instruments

NHK : Actually that... It's not a timekeeping tool... You wouldn't believe it... It's called an Ino Odoshi (= Shishi Odoshi / Boar Driver)~... Hahahahaha .... It's also known as Sindo (= そうず)... Now it's one of the decorations in Japanese gardens... In ancient times... It's a waterway installed in a field... It was used to scare away wild boars and other small animals... They were afraid that if they stayed in the fields at night... They'll eat or trample the crops.. ..one side is a bamboo or wooden tube that flows with the water... ..and a stone on the other side... That stone... It's called "knocking stone"... In the quiet of the night... The bamboo tube and the stone... Knocking... The sound effect... It's very obvious... The "Pan Pan" sound. .... It's called the "Pig Odoshi" sound. ........