How was Snowball able to appeal to his fellow animals with the Windmill?

Snowball appealed to the other animals by illustrating everything the wondmill would mean to them.... the windmill could work and do their jobs, all while they relaxed.

After surveying the ground, Snowball declared that this was just the place for a windmill, which could be made to operate a dynamo and supply the farm with electrical power. This would light the stalls and warm them in winter, and would also run a circular saw, a chaff-cutter, a mangel-slicer, and an electric milking machine. The animals had never heard of anything of this kind before (for the farm was an old-fashioned one and had only the most primitive machinery), and they listened in astonishment while Snowball conjured up pictures of fantastic machines which would do their work for them while they grazed at their ease in the fields or improved their minds with reading and conversation.