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" AB, in contact with this edge, then reverse the triangle so that both edge and line may be free from shadow, and move the edge of the triangle toward the line. If they coincide, the angle is 90°. If they do not coincide, and the vertex of the angle formed... "
Elements of Mechanical Drawing: The Use of Instruments, Theory of Projection ... - Page 3
by Gardner Chace Anthony - 1904 - 152 pages
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Encyclopedia of Engineering: A Treatise on Boilers, Steam Engines ..., Volume 7

Calvin Franklin Swingle - Engineering - 1906 - 490 pages
...vertical edge of the triangle is at the top, the angle is greater than 90° by half the angle indicated. If the vertex of the angle is below, the angle is less than 90° by half the amount indicated. Fig. 16 — Triangular Scale. Scales. The best and most convenient form of scale for general use is...
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Practical Mechanical Drawing and Machine Design, Self Taught ...

Charles Westinghouse - Machine design - 1906 - 168 pages
...vertical edge of the triangle is at the top, the angle is- greater than 90° hy half the angle indicated. If the. vertex of the angle is below, the angle is less than 901 by half theģ amount indicated. 17 — French Curves. scale is 12 inches, not counting the small...
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Standard American Cyclopedia of Steam Engineering: A Treatise on the Care ...

Calvin Franklin Swingle - Steam engineering - 1913 - 1270 pages
...vertical edge of the triangle is at the top, the angle is greater than 90° by half the angle indicated. If the vertex of the angle is below, the angle is less than 90° by half the amount indicated. Fig. 10—Triangular Scale. Scales. The best and most convenient form of scale for general use is that...
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An Introduction to the Graphic Language: The Vocabulary, Grammatical ...

Gardner Chace Anthony - Mechanical drawing - 1922 - 194 pages
...the triangle so that both edge and line may be free from shadow, and move the edge of the triangle toward the line. If they coincide, the angle is 90°....square, as indicated by the dotted position, Fig. 143, and draw a line to coincide with the long edge. Reverse the triangle so as to bring the second...
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An Introduction to the Graphic Language: The Vocabulary, Grammatical ...

Gardner Chace Anthony - Mechanical drawing - 1922 - 188 pages
...by line and edge is at the top, as shown by A, the angle is greater than 90° by half the angle BAC. If the vertex of the angle is below, the angle is less than 90° by half the amount indicated. TEST or 45° ANGLE. — If the 90° angle is known to be correct, place the 45° triangle on the T square,...
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