A Practical Course in Mechanical Drawing for Individual Study and Shop Classes, Trade and High Schools

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Popular mechanics Company, 1910 - Mechanical drawing - 128 pages
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A fine, concise handbook for mechanical drafting.

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Page 43 - Cycloid. The cycloid is a curve generated by a point on the circumference of a circle which rolls on a straight line tangent to the circle.
Page 43 - A cycloid is the curve generated by the motion of a point on the circumference of a circle rolled in a plane along a straight line. If the circle is rolled on the outside of another circle, the curve generated is called an "epicycloid"; if rolled on the inside, it is called a "hypocycloid.
Page 14 - Fig. i. 7. The triangles, which are used to draw oblique and perpendicular lines, should rest upon the upper edge of the T square. Many and various combinations of angles may easily be made by combining both the 30-60 and 45-90. The oblique side of the triangle should always be to the right while in use, whether in inking or penciling.
Page 14 - ... instrument. 3. To get clean, sharp lines, pencils should be sharpened frequently, but under no circumstances must ridges be made on the drawing by heavy pressure on the pencil. 4. Use a soft gum eraser to clean the drawing before inking, that a glossy finish, to black lines may be retained. Use ink-erasers for pencil lines only in exceptional cases where the pencil has caused deep ridges in the paper. All division lines should be erased before inking. 5. All dimensions should be stepped off from...

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