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An instrument for measuring the declination of the magnetic needle.

Same as Decameter.

An instrument to measure the height and diameter of trees.

An instrument for ascertaining the specific gravity or density of a substance.

A sort of electroscope, invented by Rousseau, in which the dry pile is employed to measure the amount of electricity transmitted by different bodies, or to determine their conducting power. Nichol.

ight line through the center of an object from side to side; width; thickness; as, the diameter of a tree or rock.

An instrument for measuring the transparency of the air.

An instrument for examining the thermal resistance or heat- conducting power of liquids.

An instrument for measuring the dilatation or expansion of a substance, especially of a fluid.

Having two poetical measures or meters. -- n.

An instrument for measuring the quantity of dew on the surface of a body in the open air. It consists of a balance, having a plate at one end to receive the dew, and at the other a weight protected from the deposit of dew.

An instrument for accurately determining the ductility of metals.

An instrument for measuring the degree of hardness; especially, an instrument for testing the relative hardness of steel rails and the like.

An instrument for measuring the intensity of the photogenic (light-producing) rays, and computing the power of object glasses.

A dynamometer.

An apparatus for measuring force or power; especially, muscular effort of men or animals, or the power developed by a motor, or that required to operate machinery.

A graduated scale for measuring the duration of sounds, and determining their different, and the relation of their intervals. J. J. Rousseau.

An apparatus for determining the amount of oil contained in any substance, or for ascertaining the degree of purity of oil.

Same as Elatrometer.

degree of rarefaction of air contained in the receiver of an air pump. [Spelt also elaterometer.]