If a barrel is poured in the vegetable garden or cistern in the shower — the water level in them will tell you a simple water-measuring device consisting of a Styrofoam float and stuck to his line or rod with the labels. For greater stability of water-measuring devices are required on the barrel to put the bar with the guide bushing.
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To keep the inquisitive child" from dangerous "experience" with an electric shock will help a simple device. In textolite disc Ø 38 mm and a thickness of 2 mm drilled Central hole Ø 3 mm...
