In relative rare cases one uses labor-intensive methods like irrigation with watering-cans and by filling dug-in porous pots ( pitcher irrigation ) from where the water enters the soil by capillary suction.
12.
He also introduced a powerful battery at the annual meeting of the British Association for the Advancement of Science in 1839 . Grove's first cell consisted of zinc in diluted sulfuric acid and platinum in concentrated nitric acid, separated by a porous pot.
13.
The "'Bunsen cell "'is a zinc-carbon primary cell ( colloquially called a " battery " ) composed of a zinc anode in dilute sulfuric acid separated by a porous pot from a carbon cathode in nitric or chromic acid.
