Figure 2-1. - Title block.
The revision block is usually located in the upper right-hand comer of the blueprint and is used for recording of changes (revisions) to the print. All revisions are noted in this block and are dated and identified by a letter and a brief description of the revision (fig. 2-2).
The graphic representation of the project is drawn to some proportion of the actual size of the project. One-eighth inch on such a drawing is equal to a foot of the actual size of the project. Although the original drawing is scaled accurately, your drawing will be a copy of that original and will not likely be the same size as the original drawing. The copy may have been reduced slightly. The paper size is also affected by temperature and humidity. The paper may stretch or shrink. Because of these factors, do not rely on measurements taken by laying a rule on the drawing. For example, do not assume that a number of units (as 1/8-inch increments) on the drawing is equal to that same number of feet on the project. This may or may
Figure 2-2. - Revision block.Continue Reading