Excerpt from Free Hand Drawing and Designing
One of the greatest requirements of the modern engineer is to be able to make rapid neat sketches freehand, i. e. without the use of any drafting instruments, but simply by employing a well sharpened soft pencil and an eraser. There are many cases in the daily practice of every engineer from the lowest to the highest ranks, when they are called upon to make a free-hand sketch of a job, and in some cases this rough sketch remains later the only available record of the condition of the job before any changes took place. It is therefore important to have such sketches done as neatly and accurately as possible so that they would convey the correct idea to the draftsman or to the man who is to carry out the particular work represented by such sketches.
There are two principal kinds of sketches employed in describing engineering work: the actual picture of the job, as it appears to the eye; and the orthographic projection of the object in the three principal planes, but drawn roughly without the aid of instruments and not to correct scale. We will endeavor in the following chapters to cover the principles of both types of sketching, beginning with the simplest objects first and then leading up to the free-hand drawing of more or less complicated parts of machinery.
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