18WuD2x

740 water adsorption • WATS
material, but not by absorption. Also see AD-
SORPTION.
water analogy The useful, but not wholly accurate,
teaching device of comparing an electric
current with the flow of water. In such a comparison,
voltage is shown equivalent to water pressure,
and current to the quantity (e.g., gallons) of
water flowing in unit time.
water battery A primary battery or cell using water
as the electrolyte.
water calorimeter A calorimeter used to measure
power in terms of the increase in temperature of
water heated by the electrical energy.
water capacitor An emergency capacitor made by
setting one glass of water in another larger jar of
water so that the two bodies of water are separated
by the walls of the smaller jar. The bodies of
water, in which an electrolyte has been dissolved,
form the “plates” of the capacitor, and the wall of
the smaller jar serves as the dielectric between
them.
Electrode
Jars
Electrode
water capacitor
water-cooled tube A power tube, such as a large
radio transmitting tube, cooled by the circulation
of water in the space between the outside of the
tube envelope and a surrounding jacket.
water cooling A method of cooling components by
pumping water through pipes surrounding them.
water-flow alarm An electronic circuit that actuates
an alarm when the flow of water through
pipes or other channels changes from a predetermined
rate.
water-flow control A servo system for automatically
maintaining or adjusting the flow of water
through pipes or other channels.
water-flow gauge See WATER-FLOW METER.
water-flow indicator See WATER-FLOW METER.
water-flow meter An instrument used to monitor
the flow of water through pipes or other channels,
sometimes showing its direction as well as its
rate.
water-flow switch In water-cooled systems (e.g.,
water-cooled tubes), a switch that actuates an
alarm when the water slows or stops.
water glass Sodium silicate, a substance used as a
fireproofing agent and protective coating.
water ground An earth connection made by dropping
a weighted wire into a body of water.
water jacket In a water-cooled device, the outer
jacket that, along with the outer wall of the cooled
component, forms a space through which the
cooling water flows.
water-level control A servo system that automatically
maintains or adjusts the level of water inside
a tank or other container.
water-level gauge An electronic system that gives
direct water level readings inside a tank or other
container.
water-level indicator See WATER-LEVEL GAUGE.
water load 1. A makeshift, power-dissipating resistive
load (see DUMMY LOAD) consisting of a
container of tap water or saltwater into which two
wires are immersed. 2. A waveguide termination
containing water heated by the microwave energy.
It is usable as a water calorimeter.
water monitor A sensitive electronic instrument
for checking radioactivity in a water supply.
water-pipe ground An earth connection made by
running a wire to the nearest cold-water pipe.
This scheme works only with metal pipes devoid
of insulating joints or splices.
water power Hydroelectric power (i.e., electrical
energy produced by generators driven by water).
water-pressure alarm An electronic circuit that
actuates an alarm when water in pipes or other
channels changes from a predetermined level.
water-pressure control A servo system for automatically
maintaining or adjusting water pressure
in pipes or other channels.
water-pressure gauge See WATER-PRESSURE
METER.
water-pressure indicator See WATER-PRESSURE
METER.
water-pressure meter An instrument that directly
indicates water pressure in a pipe or tank.
water-pressure switch A switch that actuates an
alarm when water pressure rises or falls.
water pump In a water-cooled electronic system, the
(usually rotary) pump that circulates the water.
water resistor An electrolytic resistor in which the
electrolyte is tap water or diluted saltwater.
water rheostat A variable water resistor. Usually,
the resistance is varied by moving the immersed
electrodes closer together or farther apart.
water tester An instrument for checking pH, electrical
resistance, and other properties of water.
water witching Locating underground water by
electronic methods.
WATS Acronym for Wide Area Telephone Service. A
form of long-distance telephone service. Rates are
charged on a different basis than normal longdistance
service. The system is especially favored
by businesses because it saves money for subscribers
making a large number of calls in each
billing period.