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Science and art drawing : complete geometrical course ; consisting of plane and solid geometry, orthographic and isometric projection, projection of shadow's the principles of map projection, graphic arithmetic and graphic statics (1895)

Spanton, J. Humphrey (John Humphrey) · London : Macmillan · leaf 150

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Fig. 254. difference of the similar figures represented by the correspondinglines ab and ca. Note.—These similar figures may be of any conceivableshape. CHAPTEE XI INSTRUMENTS FOR MEASURING ANGLES, ETC. A protractor is an instrument used for measuring or setting offangles; it may be either… … the radiating lines are drawn, and corresponds with the centreof the circle. The degrees are numbered in primary divisions, equal to tendegrees each, on the outside line from A; and on the inside linefrom B. In the actual instrument each of these primary divisionsis subdivided into ten secondary…

Geometrical drawing

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