They are snatch blocks for steel cable - not fiber rope. They can actually be used as a block and tackle by running a cable from a winch around one of the pulleys on the double block, then around the single block, and secure the bitter end of the cable to the thimble on the double block.
You actually have a mis-matched pair, as both of them should be double pulleys to rig it correctly.
OR
Move the thimble and secure the bitter end of the cable to the single pulley, so you can utilize both sides of the double pulley.
It will be fairly easy to figure out just by experimenting a bit.
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Today's Featured Article - Harvestin Hay: The Early Years (Part 2) - by Pat Browning. The summer of 1950 was the start of a new era in farming for our family. I was thirteen, and Kathy (my oldest sister) was seven. At this age, I believed tractor farming was the only way, hot stuff -- and given a chance I probably would have used the tractor, Dad's first, a 1936 Model "A" John Deere, to go bring in the cows! And I think Dad was ready for some automation too. And so it was that we acquired a good, used J. I. Case, wire tie hay baler. In addition to a person to drive th
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