File:Practical engineering drawing and third angle projection, for students in scientific, technical and manual training schools and for draughtsmen (1897) (14594457550).jpg

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Identifier: practicalenginee00will (find matches)
Title: Practical engineering drawing and third angle projection, for students in scientific, technical and manual training schools and for ... draughtsmen ..
Year: 1897 (1890s)
Authors: Willson, Frederick Newton, 1855-1939
Subjects: Mechanical drawing Lettering
Publisher: Princeton, N.J., The author
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

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30 THEORETICAL AND PRACTICAL GRAPHICS.
Text Appearing After Image:
PLANE PROBLEMS. 31 by trial and error is often resorted to, and even for ordinary cases it is by no means to bedespised. By it the di\iders are set by guess to the probable chord of the desired arc, and, sup-posing a heptagon wanted, the chord is stepped off seven times around the circumference; care beingtaken to have the points of the di^dders come exactly on the arc, and also to avoid damaging thepaper. If the seventh step goes past the starting point the di^dders require closing; if it falls short,the original estimate was evidently too small. Obviously the change in setting the di^dders oughtin this case to be, as nearly as j^ossible, one-seventh of the error; and after a few trials one should come out even on the last step. 102. Proh. 17. To lay off on a given circle an arc of the same length as a given straight line.^ Lett (Plate I, Fig. 1) be one extremity of the desired arc; ts the given straight line and tangent tothe circle; tm equal one-fourth of ts, and sx drawn with cent

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  • bookid:practicalenginee00will
  • bookyear:1897
  • bookdecade:1890
  • bookcentury:1800
  • bookauthor:Willson__Frederick_Newton__1855_1939
  • booksubject:Mechanical_drawing
  • booksubject:Lettering
  • bookpublisher:Princeton__N_J___The_author
  • bookcontributor:The_Library_of_Congress
  • booksponsor:The_Library_of_Congress
  • bookleafnumber:37
  • bookcollection:library_of_congress
  • bookcollection:americana
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30 July 2014
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current22:21, 23 September 2015Thumbnail for version as of 22:21, 23 September 20151,884 × 2,580 (357 KB)Fæ (talk | contribs)== {{int:filedesc}} == {{information |description={{en|1=<br> '''Identifier''': practicalenginee00will ([https://commons.wikimedia.org/w/index.php?title=Special%3ASearch&profile=default&fulltext=Search&search=insource%3A%2Fpracticalenginee00will%2F fin...

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