https://www.cca.qc.ca/en/events/101033/is-there-a-known-optimum-gate-size-for-the-dual-control-of-cattle-and-sheep
In this volume of the CCA Singles series, Sofia Nannini discusses a small but representative collection of files within the Cedric Price fonds at the CCA: a...
sofiananniniknownoptimumgate
https://laughingsquid.com/brazilian-farmers-rig-a-clever-cattle-gate-that-opens-automatically-without-electricity/
A clever automatic gate created by Brazilian farmers opens without electricity to let cars pass through.
cattle gatebrazilianfarmersrigclever