Elements of geometry for the use of schools (1854)
Ireland. Board of National Education · Dublin : A. Thom · leaf 63
cts F, G.Place the fixed ruler D A B, so that the eyeapplied at D, may see one of the two objects, F, through the two sights D and B. Then, PART FIRST. 53 without moving the instrument, direct the Bwofthefe- ° • strumentcal- other ruler, so that the eve placed at E may udasemi- J circle, in see the… … LX. When we wish to draw on paper an angle ^900rtjn!;h^of a given number of degrees, we use the J^Sminstrument K, which is also divided into 180 ^numbo.degrees. It is called the Reporter. Placing of degree8-the centre A on the point of the angle which 54 ELEMENTS OF GEOMETRY. we wish to draw, and…
Geometry
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