Start by placing your eyes at a distance from the images that is roughly three times their spacing, i.e. about 60 cm for the pair on the front & back cover of the printed CREG journal or about two screen widths if you are viewing the images online.
Now hold a finger vertically in front of your nose at a distance from your eyes that is roughly twice the distance between your eyes – about ⅔ of a hand's breadth, or 15 cm – it does not have to be exact.
Looking with your right eye (i.e. with your left eye shut), align your finger with a feature near the centre of the left image.
Now, looking with your left eye (i.e. with your right eye shut), try to align your finger with the same feature near the centre of the right image. This will involve a certain amount of moving your finger left to right and forwards and backwards.
When you have the correct alignment of your finger, open both eyes, focus on the tip of your finger, so that your sight-lines converge on your finger to view the now correctly aligned images behind your finger. The images should spring into 3D.
It is worth persevering with this – rather than just being recalcitrant and declaring that it "doesn't work" – because it does work and once you have mastered the technique you will find it so simple and easy that you can dispense with the alignment procedure altogether and just focus on a point in front of the stereo pair, whereupon it will immediately snap into 3D. The salient point is that, once your brain gets an inkling of what is required, your optical sub-system will take over from your conscious control and will align the images for you.
As discussed in the main text (Gibson, 2022), you can then experiment with moving closer or further away from the images. They will stay locked in whilst you do this, and you will see a greater 3D depth as you move further away.
Note that the finger-at-⅔-hand's-breadth rule needs to be modified when viewing very small or very large images. For very large images, start at a hand's breadth. For very small images the distance should be three times the image separation.
A more detailed discussion on how to view reversed images is in the article in CREG journal 117 — Gibson, David (2022), Viewing Poster-Sized Stereo Pairs, CREGJ 117, pp22-24,1. March 2022