Here's the Sheldon Brown page on tire sizes that Leebo mentioned:

Tire Sizing Systems

Over the years, there have been at least a few different "26 inch" tire sizes that aren't interchangeable. There are even multiple "26 x 1 3/8" sizes that aren't compatible with one another. I'm guessing your Free Spirit has rims designed for EA3 tires with a 590 mm bead seat diameter. (Same size as the French 650A size.) According to Sheldon, that size was used on "Most English 3-speeds, department-store or juvenile 10 speeds". It's not a common size, especially for modern bikes.

650A rims are available, but scarce. AEBike.com lists them on their web site HERE, but it's just a rim -- not an assembled wheel. You'd have to lace the rim to a hub yourself or have it done ($$$).

I'd personally be really hesitant to buy used "26 inch" rims for those tires because there's a good chance it'll be the wrong kind of "26 inch" rim. You'd want to measure the rim before buying it to be sure, and I'd guess many online sellers wouldn't bother. And if they did, there's a pretty good chance they'd get it wrong. Off by just a few mm and you might buy the wrong (incompatible) size.

Oh, and then there's the challenge of finding a bike that'll fit 650A wheels.

Honestly, I think the most practical use for those tires may be to leave them on that bike.