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Hello. Would anyone be able to confirm how an aperture tube site functioned? My thinking is that the front of the tube was fixed and must have had a post while the rear of the tube had adjustment for windage and elevation? The top rifle in the illustration is similar to what I am thinking. Thank you. Kurt

I think you understand it correctly. There would be a post or ring at the front, and the rear of the tube would be deflected by vertical and lateral external adjustments.

The rear would have an aperture to aim through and possibly a corrective lens.

I have never used one, but a modern version used to be offered on .22 B.S.A. Martini International match rifles.

I assume that the tube was intended to eliminate varying light conditions from the side or above, but otherwise I can see little advantage over the more usual front short tube and aperture rear sight.

Some of these tube sights came with interchangeable apertures both front and rear. So you could adjust the aperture size at the rear, and the type and size aperture at the front. Other than magnification these adjust much like a long tube scope, but work like iron sights.
I've owned one Unertl tube sight, and a couple unknown maker's tube sights. Only restriction I've found is they don't adjust enough to shoot much past 200yds.