Minecraft wiki entry for Egg_farming, associated text: The hatcher consists of two droppers facing up, with a dispenser facing up on top of them. These are fed by the hoppers, with the chest providing extra storage, and driven by a 3-clock. The clock is on the right edge of the diagram, from the block with the lever southwards and downwards. That lever lets you disable the hatcher completely—place it and turn it on as soon as the clock is built, so you can build the rest without clicking noises.