Anemometer

an instrument for measuring the velocity or pre ure of the wind, Robinson's anemometer, which is the form usually employed at meteorological stations, consists of two horizontal arms cro ing each other at right angles, to the ends of which are fixed hemispherical metal shells, so arranged that when the whole is supported on a pivot at the centre, the action of the wind will produce rotation, which is directly proportional to the wind velocity. Osler's an emo i meter registcrs wind pre ure thus: A pencil, moved by clockwork acro a sheet of paper, is made to diverge correspondingly with the pre ure of the wind ona metal plate, acting through metal springs on the pencil. Anemone, ® genus comprising about. seventy species of Ranunculaccous plants, native of cold \ OY, a mn "nn vf ANEVONE (4. nemorosa), showing flower, leaf and root. and temperate regions. They are perennial herbs with divided radical leaves. The whole plant. is very acrid, The name signifies wind flower, and several species are garden favourites, Anemone, Sia. [ACTINIA.] Anemophilous, 1 botanical term signifying pollinated by wind, applied to such plants as hazel, pines, plantains, and gra es, In which the pollen is usually very abundant, smill-grained, and smooth, and is carried by wind, often on to aq plumose stigma. This is facilitated in some cases by the flowers being produced before the leaves, or by lateral air bladders on the pollen grain. Aneroid Barometer, a barometer which does not contain a liquid, but has a vacuum box nearly empty ¢f air, and constructed for elasticity of corrugated metal, which is acted upon by the atmospheric pre ure.