A text book of physics, for the use of students of science and engineering (1918)
Duncan, John, d. 1941, Starling, Sydney George, 1873- · London Macmillan · leaf 40
ircular scale dividedinto half-degrees is engravedon A and the arm has avernier. The centre of thesemicircular scale lies atthe intersection of two crosslines ruled on a piece ofglass at D. The edge BC,on being produced, passesthrough the zero arrow onthe vernier and also throughthe point of… … 15 i20 .25 |0 5| 10, 15, Villi I I i I I I I I I 1* 51 10, 15, 1,1,1,1,1,1,1,1,1,1,1,1/ 1111 i|,rp,|,|,|,|lllfl [ |M 30 20 AFig. 13.—Protractor scale and vernier. and it has 30 divisions ; hence it reads to one-thirtieth of a scaledivision, i.e. to one minute. The object of taking zero at the…
Physics
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