FROM THE 1955 JOHNSON SMITH & COMPANY NOVELTIES CATALOG....THE LOCA-SCOPE
Click on the photo. We're not exactly sure how this works and there is precious little online about it. It appears to have worked similarly to a rifle scope. You can occasionally find these for under forty dollars on ETSY or EBAY.
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It looks like you could use two local landmarks to triangulate your position. Say a crooked tree and a rock outcropping. Then if you come back a day or a week later, you move to where your view of those two objects is the same as when you captured the original view. Of course if you're over the next rise, it would do you no good. Useful for bass fishermen, or to find the treasure you buried in the forest, Jean Valjean style, I suppose. Not much good on a body of water so vast you couldn't see landmarks. Of course they didn't have GPS in those days . . . .
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