0 a device used for measuring and drawing angles. It is usually in the form of half a circle made from transparent plastic with degrees printed on it. -- 量角器；分度規
Finally, the initial angle could be measured with a simple protractor.
More commonly the set square bears the markings of a ruler and a half circle protractor.
These data can be computed manually, using special protractors and slide rules with precomputed firing data.
He quantified handwriting by use of a microscope, caliper, pressure board, ruler, protractor and slow-motion pictures.
It combined a compass with a protractor built into the base.
Dice determined wind speed and direction, and hence the ship's speed and the use of its cannon by measuring angles with the protractor.
Rulers, protractors and compasses can be taken into the examination.
One ran, as it were, with the protractor alongside, knowing that in many cases the long jump depended on height and not length.
