This section is from the book "Manual Of Cardboard Construction For Third And Fourth Grades", by Charles A. Kunou. Also available from Amazon: Manual of cardboard construction for third and fourth grades.
Line 1. Ordinary or full line, outline, to be cut.
Line 2. Dotted line, construction line, help line; to obtain figure, not to be scored.
Line 3. Dashed line, to be scored, not cut.
Line 4. Dimension line, to indicate size of figures and parts thereof.
(Pupils should draw their figures in ordinary lines only.)

 
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