# References

Last Updated on Sat, 09 Sep 2017 |

Drafting
No supplementary references are needed for this task.

### 1. Introduction

In task one of this subcourse, we covered orthographic projection and freehand drafting. In this task, we will cover drafting instruments and the fundamentals of geometric construction.

### 2. Drafting Instruments

In the following paragraphs, we will cover some of the drafting instruments that may be encountered and used; however, we will not cover such common instruments as pencils and erasers.

a. Scales. Scales are used for linear measuring. The scale most commonly used by a draftsman is one with its inches graduated into sixteen divisions, with each division measuring one-sixteenth of an inch. Figure 16 (on the following page) shows part of a "16 to the inch" scale, together with some sample measurements. Unlike a real scale, the scale in figure 16 has the first inch completely labeled to help you become familiar with the different fractional values. Measurements more

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