Winsted Tools


     
 

Masters' Library


 
  Mechanical Drawing Self-taught by Joshua Rose, 1889    

In the pages of this book, the author has sought to impart to the beginner, such elementary information as would enable him, with application and practice, to make simple mechanical drawings without the assistance of a teacher.

To accomplish this end, it has been necessary to mainly confine the subject-matter to the actual drawing of elementary pieces of machinery, and in many cases to show the pencil lines of the drawing, which possesses great advantages for the learner, since it is the producing of the pencil lines that really proves the study, the inking-in being merely a curtailed repetition of the pencilling.

Similarly when the drawing of a piece, such, for example, as a fully developed screw thread, is shown fully developed from end to end, even though the pencil lines are all shown, yet the process of construction will be less clear than if the process of development be shown gradually along the drawing.

Thus beginning at an end of the example, the first pencil lines only may be shown, and as the pencilling progresses to the right-hand, the development may progress so that at the other, or left-hand end, the finished inked-in and shaded thread may be shown, and between these two ends will be found a part showing each stage of development of the thread, all the lines being numbered in the order in which they were marked. This prevents a confusion of lines, and makes it more easy to follow or to copy the drawing.

The numerous inquiries from working machinists for a book of this kind have led the author to its production, which he hopes and believes will meet the want thus indicated, giving to the learner a sufficiently practical knowledge of mechanical drawing to enable him to proceed further by copying such drawings as he may be able to obtain, or by the aid of some of the more expensive and elaborate books already published on the subject.

 

He believes that in learning mechanical drawing without the aid of an instructor the chief difficulty is overcome when the learner has become sufficiently familiar with the instruments to be enabled to use them without hesitation or difficulty, and it is to attain this end that the chapter on plotting mechanical motions and the succeeding examples have been introduced; these forming studies that are easily followed by the beginner, while sufficiently interesting to afford to the student pleasure as well as profit.

July 15, 1889.


 
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