The science of Hydraulics comprehends the laws which regulate
non-elastic fluids in motion, and especially water, etc.
Water can only be set in motion by two causes--the pressure of the
atmosphere, or its own gravity. The principal law concerning fluids
is, that they always preserve their own level. Hence water can be
distributed over a town from any reservoir that is higher than the
houses to be supplied; and the same principle will enable us to
form fountains in a garden, or other place. Should any of our young
readers wish to form a fountain, they may, by bringing a pipe from a
water-tank, which should be at the upper part of the house, convey
the water down to the garden. Then, by leading it through the earth,
underneath the path or grass-plot, and turning it to a perpendicular
position, the water will spring out, and rise nearly as high as the
level of that in the tank. The pipe should have a faucet, so that the
water may be let on or shut off at pleasure.