Fry, Horace Pugh. [from old catalog] · Philadelphia · leaf 21
18 9. Construction lines (see Fig. 13) are fine dash lines andare used largely in elementary work; they connect the projectionson two adjacent planes. These lines should not touch the pointsbetween which they are drawn. (See Figs. 9 and 10.) … Fig. 16. 10. Adjacent part lines are drawn like construction lines.They are used to show a part that is adjacent to the piece drawn. 11. Extension lines are full light lines used to prolong thelines of a drawing in order to place a dimension away from theview or at a more readable place; they…
Mechanical drawing
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![An illustration from Champ fleury : au quel est contenu lart & science de la deue & vraye proportio[n] des lettres attiques, quo[n] dit autreme[n]t lettres antiques, & vulgairement lettres romaines proportionnes selon le corps & visage humain ... (1529)](https://img.insideoutlibrary.com/img/200/ia-champfleuryauque00tory-125-85.webp)
