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 - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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