Practical engineering drawing and third angle projection, for students in scientific, technical and manual training schools and for ..draughtsmen .. . mimimmmmiiimmmmfmmmmmm^^^ EXERCISES FOR PEN AND COMPASS. 21 CHAPTEIt IV. GEADES OF LINES. —LINE TINTING. —LINE SHADING. —CONVENTIONAL SECTION-LINING.—FREQUENTLY RECURRING PLANE PROBLEMS.—MISCELLANEOUS PEN AND COMPASS EXERCISES. 65. Several kinds of lines employed in mechanical drawdng are indicated in the figure getting his elementary practice with the ruling-pen the student may group them as shown,or in any other symmetrical arrange
Practical engineering drawing and third angle projection, for students in scientific, technical and manual training schools and for ..draughtsmen .. . mimimmmmiiimmmmfmmmmmm^^^ EXERCISES FOR PEN AND COMPASS. 21 CHAPTEIt IV. GEADES OF LINES. —LINE TINTING. —LINE SHADING. —CONVENTIONAL SECTION-LINING.—FREQUENTLY RECURRING PLANE PROBLEMS.—MISCELLANEOUS PEN AND COMPASS EXERCISES. 65. Several kinds of lines employed in mechanical drawdng are indicated in the figure getting his elementary practice with the ruling-pen the student may group them as shown,or in any other symmetrical arrangement, either original with himself or suggested by other designs. Lgr- 33. -t- CENTRE LINE. If red. CENTRE UlNE. If black. V. ! ^^ FOR ORDINhRY OUTLINES. V^ HIDDEl[l LINE IMEDIUM, Continuous. DOTTED LI N E_ usually employed as a construction *^ SHADE Jjt^ LIME DOTTED LINEI line of_motibn in Kinematic When drawing on tracing cloth or tracing jjaper, for the purpose of making blue-prints, all thelines wiU preferably be black, and the centre and dimension lines distinguished from others as indi-cated above, as also by being somewhat finer than those employed for the light outlines of theobject. Heavy, opaque, red lines may, however, be used, as they will blue-print, though faintlj-. There is at present no universal agreement among the members of the engineering profession asto standard dimension and centre Unes. Not wishing to add another to the systems already atvariance, but preferring to facilitate the securing of the unifonuity so desirable, I have presentedthose for some time employed by the Pennsylvania Railroad and now taught at Cornell University. The lines of Fig. 33, as also of nearly all the other figures of this work, having been printed from blocks made by thecerographlc process (Art. 277), are for the most part too light to serve as examples tor machine-shop work. Fig.
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Keywords: ., bookcentury1800, bookdecade1890, booksubjec, booksubjectlettering
