Garden tanks, cisterns, basins and ponds

2207. Reservoirs for water may be either tanks, cisterns, basins, or ponds. Tanks and cisterns are sometimes old barrels, well tarred or painted, and then sunk in the soil; occasionally they are framed boxes of timber, the joints filled with oxide of lead and oil, and the whole pitched over, and then placed where they are to remain either above or on a level with the surface.