Mechanical Drawing for Secondary Schools
Mechanical Drawing for Secondary Schools
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In our eReader you can find the full English version of the book. Read Mechanical Drawing for Secondary Schools Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book Mechanical Drawing for Secondary Schools
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They are usually made of maple, mahogany, or pearwood, and their edges are often lined with hardwood or celluloid.
FIG. 123. T-SQUARE. PLAIN AND SWIVEL, HEAD The celluloid edges make it possible to see lines near the one to be drawn and are therefore quite convenient when joining lines at corners, etc.
The upper or working edge of tht T-square and the edge of the head which rests against the drawing should be perfectly straight. The edge of the blade may be tested as follows : 1. Draw a long li...ne along the edge of the blade.
2. Reverse the ends of the blade with respect to the ruled line, keeping the same side up and bringing the same edge against the ruled line.
3. Draw a second line along the edge of the blade. If the edge of the blade is straight the two lines will coincide. Both the head and the blade of the T-square may also be tested by means of a straightedge. Since the T-square is used only for ruling parallel lines, and as lines at other angles are drawn with the triangles in combination with the T-square, it is evident that the accuracy of the angles beween lines drawn with the T-square PENCIL MECHANICAL DRAWING 121 and those drawn with the triangles does not depend upon the angle of the blade to the head of the T-square.
What to read after Mechanical Drawing for Secondary Schools?
You can find similar books in the "Read Also" column, or choose other free books by Fred D Fred Duane Crawshaw to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
They are usually made of maple, mahogany, or pearwood, and their edges are often lined with hardwood or celluloid.
FIG. 123. T-SQUARE. PLAIN AND SWIVEL, HEAD The celluloid edges make it possible to see lines near the one to be drawn and are therefore quite convenient when joining lines at corners, etc.
The upper or working edge of tht T-square and the edge of the head which rests against the drawing should be perfectly straight. The edge of the blade may be tested as follows : 1. Draw a long li...ne along the edge of the blade.
2. Reverse the ends of the blade with respect to the ruled line, keeping the same side up and bringing the same edge against the ruled line.
3. Draw a second line along the edge of the blade. If the edge of the blade is straight the two lines will coincide. Both the head and the blade of the T-square may also be tested by means of a straightedge. Since the T-square is used only for ruling parallel lines, and as lines at other angles are drawn with the triangles in combination with the T-square, it is evident that the accuracy of the angles beween lines drawn with the T-square PENCIL MECHANICAL DRAWING 121 and those drawn with the triangles does not depend upon the angle of the blade to the head of the T-square.
What to read after Mechanical Drawing for Secondary Schools?
You can find similar books in the "Read Also" column, or choose other free books by Fred D Fred Duane Crawshaw to read onlineMoreLess
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