In addition to the hourglass, there are more structurally similar water. Their simplified version can be made and most. Enough to take two graduated bottles for baby food and to connect them with their necks in one tube, which is inserted two thin tubes, so that their opposite ends do not reach the bottom of the bottle. Time can be tracked for graduation or to apply a special scale by looking at the clock.
Recommend to read
THE PATCH OF THE TIRES…
I read in the journal "modelist-Konstruktor" No. 6, 1993 article "Vitamins grow on the balcony." From her I learned about the use of pyramids of old tires as a vertical garden. Intrigued...
COLLET-UNIVERSAL
Clutch pencil, calculated on a fat pencil, can find unexpected applications. For example, help in cases when a small screw you need to tighten in tight spaces; turn into a ballpoint pen,...
