Jamison, Alpha Pierce. [from old catalog] · New York, J. Wiley & sons; · leaf 32
broken lines drawnthrough the center of a drawing or drawings, as the case may ELEMENTARY PRINCIPLES AND DEFINITIONS. 13 be, and are used to align the different views—to producean axis of symmetry. When two center lines are employed, theyare usually at right angles, one being horizontal and one… … Fig. 5Such Drawings require the Use of Center Lines. V / \ Fig. 6Such Drawings require no Center Lines. 33. Section Lines.—Section lines are broken lines carriedthrough the drawing to indicate the line (plane) on which thesection has been taken—the line on which the object has beencut. 14…
Mechanical drawing
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