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 - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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