Mechanical Drafting - Revised in 1915 #254947

The above principles were followed by first design ing a very flexible course in drafting, substituting draw ings of machine parts for the conventional geometrical figures. The work was arranged into definite groups, according to subject, each group being scheduled for a definite amount of time. Second, the text was so ar ranged that section, lesson or chapter one, gave all information necessary for the work included in group one, etc.