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An instrument for determining and registering the variations in the size or volume of a limb, as the arm or leg, and hence the variations in the amount of blood in the limb. -- Pleth`ys*mo*graph"ic, a.

A self-registering rain gauge.

The act of voting, or of registering a vote. Polling booth, a temporary structure where the voting at an election is done; a polling place.

A machine for registering automatically the number of persons passing through a gateway, fares taken, etc.; a telltale.

The act of registering; registry; enrollment.

An apparatus for registering the shocks and undulatory motions of earthquakes.

The art of registering the shocks and undulatory movements of earthquakes.

A recording or registering tachometer; also, its autographic record.

A self-registering thermometer, especially one that registers the maximum and minimum during long periods. Nichol.

-- Tide gauge, a gauge for showing the height of the tide; especially, a contrivance for registering the state of the tide continuously at every instant of time. Brande & C. -- Tide lock, a lock situated between an inclosed basin, or a canal, and the tide water of a harbor or river, when they are on different levels,…

An apparatus for studying and registering the action of various fluids and drugs on the excised heart of lower animals.

A machine for registering and indicating the number and nature of bets made on horse races, as in Australia and South Africa. Called also totalizer.

A similar arrangement for registering the number of persons passing through a gateway, doorway, or the like.

order when they make observations of all the important elements either hourly or by self-registering instruments; of the second order when only important observations are taken; of the third order when simpler work is done, as to record rainfall and maximum and minimum temperatures.