[f. L. vēlōci-, vēlox swift + -METER.] An instrument or apparatus (variously constructed) for measuring the speed or velocity of engines, vessels, projectiles, etc.
1842. H. Spencer, in Civil Eng. & Arch. Jrnl., V. 231/2. The instrument represented in the annexed plate, which I have named a ‘Velocimeter,’ is intended to supersede the long calculations, frequently necessary, in obtaining velocities in engine trials.
1853. in Abridgm. Specif. Patents, Opt. etc. Instrum. (1875), 183. An instrument for measuring the steerage-way of vessels…. [The apparatus is called a] Velocimeter.
1876. Catal. Sci. Appar. S. Kens., 55. Patent electric Velocimeter,… arranged for water currents and ascertaining the speed of vessels.
