The book Introductory Course in Mechanical Drawing was written by author John C John Clayton Tracy Here you can read free online of Introductory Course in Mechanical Drawing book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Introductory Course in Mechanical Drawing a good or bad book?
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It is often unnecessary to draw a line from end to end, especially if it is a construction line. For example, in drawing two diagonals to find the centre of a rectangle, draw an inch or less of one line near the centre, and simply cross it with the other. Many similar cases occur in all construction work, where time would be wasted and unneces- sary erasing caused by drawing entire lines. 28. Inking. (a) As a rule, do not commence to ink a drawing until it is finished in pencil. The width of li...ne to be used varies with the size of the drawing the larger and more open the drawing the coarser the lines may be. Lines should not, however, be so coarse as to make the drawing seem crude, nor so fine as to make it indistinct. 32 AN INTRODUCTORY COURSE IN MECHANICAL DRAWING Lines of medium width are best suited for open plain figures, like those in the plates of this course. It is always well to test a pen after setting its nibs to see if the line is right, but this should not be done on the sheet itself nor on the drawing-board.
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