| 释义 |
rotometer|rəʊˈtɒmɪtə(r), ˈrəʊtəʊmiːtə(r)|
Also rota-.
[f. roto- + -meter.]
A hand-held measuring device incorporating a small wheel whose revolutions are registered in terms of distance travelled, e.g. on a map or plan.
1901F. W. Taylor Art of Cutting Metals (ed. 3) 91 An instrument called a ‘rotameter’, which we have found the best appliance for practical use in measuring the cutting speed. Ibid., The small wheel..which projects beyond the rim of the rotameter is firmly pressed directly against the surface of the rotating forging. 1913T. W. Croft Amer. Electricians' Handbk. 134 The rotometer (Fig. 141), is a convenient tool for scaling distances. The little wheel is run over the course of the circuit. The pointer indicates feet direct for drawings of certain scales. 1949R. Ashley Electr. Estimating i. 14/1 The map measure, commonly known in the profession as the ‘rotometer’, is considered by most electrical estimators engaged in large construction work as the most valuable of tools. 1957G. E. Hutchinson Treat. Limnol. I. ii. 166 The shore line may be measured on the map by means of a rotometer. 1971W. N. Alerich Electr. Construction Wiring xvii. 456/2 The measuring can be done with the aid of a rotameter or an architect's scale. |