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Use the Gravity Light as example, it has two actions in alternate (1) first hook the weighs at the top (2) then weighs slowly fall, till the bottom (3) repeat (1) Now compare with this (1) first open the valve to do the reset (piston float up), (2) then close the valve, let the piston slowly move do...

cannot make the water overflow on the output while providing a gravity based reset. What does this mean? I assume the "water overflow" is the water rising up on the output inlet (the narrow area inlet), and " while providing reset"..... This sounds like doing the "water ris...

This one measure the weighs of a totally submerge floatable ball (or buoy), although still doesn't know whether there's any difference on the weighs acting on the container (or piston) between a floating ball and a submerged ball.

The buoy can cause the water level to rise, but they also cause the weigh/force to increase, refer to image. If the area is 1 sq metre, that's not big, so it's inappropriate to use big buoy; use mini life-buoys that occupy a whole 10 cm height, so the water level will rise roughly 10cm, assuming the...

To improve on pulling the piston up, can add more buoys on the top of piston, or at the bottom of piston, or both.

T. volume? It's only to look good Just summarizing your description - when push down (applying force) the wide column by 1 height, 4 blocks of water move to thin column; - so at thin column, 4 blocks of water raise 4 height each - vice versa - now push down (applying force) the thin column by 4 heig...

The float + piston combined still has to have less density than water or it won't pull the piston up This is also my concern. If it can't, then do a hybrid of spring & buoy, the buoy nevertheless is still and will continue to try to float up, that can be used as support to the spring. And also ...

Same as the spring, with an opening, the buoys lift up the piston,
although it might face with some issues, like
- the opening might need to be wider
- too much friction at the edges of piston

Beside the spring, can also use buoy to lift the piston up,
but like with spring, it need an opening in order to be able to lift the piston up.

The image attached is only showing the piston resting on top of the water,
not able to be pulled up by the buoys

Image is from one of the description of the previous post, the weight/force of water pressed down the spring; and when there's opening, water flow thru and spring bounce back up.

From the image, the spring cannot rebounded back to its original length, due to water stopping its action as water is incompressible. But if there's an opening for the water to flow through, then the spring can move up, while the water flow down via the opening. ******* Another version is, the sprin...

Yep, surface tension is the most possible answer. ______________________________________________________ Just post this to show a failed setup, initially meant to test whether the water level is the same, by replicating from the previous posted image, the one with the piston with an opening. A silly...

Also the same as above, opening a hole within the piston, this time joining the water above and below the piston.

Although the end result doesn't give an equal water level, so did a test to see.... also did not have equal water level.... mmm