Cyclopedia of mechanical engineering; a general reference work Editor-in-chief Howard Monroe Raymond Assisted by a corps of mechanical engineers, technical experts, and designers of the highest professional standing . h otiierthrough their centei-s, and the position of these center lines a dimension is to be given to the center of a piece acenter line is drawn through the piece and the dimension givento this line. INVISIBLE LINE LINES CENTER LINES NSION LINES EXTENSION LINES Extension lines are sometimes used to connect two views of apiece, but, wherever it is possible t
Cyclopedia of mechanical engineering; a general reference work Editor-in-chief Howard Monroe Raymond Assisted by a corps of mechanical engineers, technical experts, and designers of the highest professional standing . h otiierthrough their centei-s, and the position of these center lines a dimension is to be given to the center of a piece acenter line is drawn through the piece and the dimension givento this line. INVISIBLE LINE LINES CENTER LINES NSION LINES EXTENSION LINES Extension lines are sometimes used to connect two views of apiece, but, wherever it is possible to use a center line, instead, thelatter is preferable. The principal use of extension lines is, as thename implies, to extend the lines of the object so as to givedimensions between them. Dimension lines aie used in giving dimensions from one lineor point to another. The ordinary lines and the invisible lines should be made ofthe same width; the sliade lines should be made considerablyheavier, and the center lines, extension lines and dimension linesshoul I be lighter. Location of Views. ? In our preceding study of projectionswe imagined our object to be held in the angle formed by two 65 MECHANICAL planes ?which jnteiseet at light angles, the planes and the objectbeing supposed to be in the position represented in Fig. 3,tiie horizontal plane II beingbelow tlie object, and thevertical plane V being be-side tlie object. We thenprojected down to theiiorizontal plane and repre-sented there the object asit would appear if seensquarely in the directionindicated by arrow A. Wenext projected into thevertical plane, and repre-sented the object as itwould appear if the line of vision took tlie direction of the arrowB. Our planes, with the horizontal and vertical projections of theobject on them, when laid out flat, as a sheet of i)aper is when weactually draw on it, would appearas in Fig. 4, the horizontal projec-tion, or top view, being vertical projection, o
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