Poured concrete silos can be top unload or bottom unload. As Pete said, top unload was originally with a fork you climbed the silo, forked it out into a cart, and forked out of the cart to the cows, or piled it up in the silo room and forked it unto a wheelbarrow. The early silo unloaders were pretty sorry pieces of equipment. You were almost as far ahead to fork it out by hand. Especially after a couple of year of wear and tear on the unloaders. Later top unloaders were much better, but reliable lifespan was relatively short because of the high acid silage tended to rust and eat the unloader up. Hand pulled carts and wheelbarrows gave way to self propelled feed carts and belt or chain type around the barn feeders in later years. Later concrete poured silos were bottom unloaders in the same tradition as the Blue Angels.
Used to be a big deal (and bragging rights) with us farm kids about how fast we could unload forage wagons at the silo. The early silo filing blowers were usually around 48 inches in diameter. Took 15 to 20 minutes to unload a wagon. As time went on the blowers got larger and the tractors hooked to them got bigger and unload times went down to the two to three minute range.
The Ag class conversations went like: We got an IH 56 blower and a 706 running it and we can unload a load of corn in 4 minutes!" next kid: Big deal! We have a clover 60 inch blower with a turbo'ed 4010 and we can unload in 3 minutes!" Next kid: So what? Pop just bought one of those JD 72 inch 1,000 rpm blowers and we have a 4320 on it and we can put a load over the top in 2 minutes 20 seconds, so there!" At which point everybody else was suitably impressed. It made for some fun conversations.
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Today's Featured Article - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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