A text book of geometrical drawing : abridged from the octavo edition : for the use of schools in which the definitions and rules of geometry are familiarly explained, the practical problems are arranged from the most simple to the more complex, and in their description technicalities are avoided as much as possible : with an introduction to isometrical drawing : and an essay on linear perspective and shadows ... (1849)
les and recede from A. B until the arms areat right angles to the bars, as shewn by the dottedlines; if moved farther round, the bars will again ap-proach each other on the other side. The bars of which the ruler is composed, being par-allel to each other, it follows, that if either edge of… … W^MuufLf.. Wntxi/i 1:Sl PLATE ViU. 35 This is its most obvious use; it is generally applied tothe drawing of inclined parallel lines in mechanicaldrawings, vertical and horizontal lines being moreeasily drawn with the square, when the drawing is at-tached to a drawing board. Application.—Problem…
